Update: 3/30/18: 
First, thanks so much to everyone who has given me suggestions to try. I 
really appreciate all of you taking the time to offer your thoughts.

I opened the iMac up and vacuumed out all of the dust (there was a lot).
It still would not start up when I had both RAM cards in (even if I used 
other RAM cards that I had from a different iMac). 
When I put one RAM card in (didn't matter which slot), I got the startup 
chime. I waited several minutes, but the display was still black. 
However, I WAS able to connect to the machine with TeamViewer now!
I was at least able to pull off all of my documents, pictures, etc. 

I ran Disk Utility Verify Disk--it said that the HD appeared to be OK.
I ran permissions repair, and here is what it said:

Repairing permissions for “Macintosh HD”Permissions differ on 
“System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/XProtect.meta.plist”;
 
should be -rw-r--r-- ; they are lrw-r--r-- .Repaired 

“System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/XProtect.meta.plist

”Permissions differ on 
“System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/XProtect.plist”;
 
should be -rw-r--r-- ; they are lrw-r--r-- .Repaired 

“System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/XProtect.plist”Permissions
 
differ on 
“Applications/Safari.app/Contents/Resources/Safari.help/Contents/Resources/index.html”;
 
should be lrwxr-xr-x ; they are -rwxr-xr-x .Repaired 

“Applications/Safari.app/Contents/Resources/Safari.help/Contents/Resources/index.html”Warning:
 
SUID file 
“System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent”
 
has been modified and will not be repaired.

Permissions differ on 
“Applications/Safari.app/Contents/MacOS/SafariForWebKitDevelopment”; should 
be -rwxr-xr-x ; they are lrwxr-xr-x .Repaired 
“Applications/Safari.app/Contents/MacOS/SafariForWebKitDevelopment” 

Permissions repair complete


I ran Permissions Repair twice, but both times, it said the info above.


Then I ran EtreCheck. That report is below.


Any other thoughts on what might be wrong?

Thanks so much!

EtreCheck version: 4.1.4 (4A203) 

Report generated: 2018-03-31 20:18:08

Download EtreCheck from https://etrecheck.com

Runtime: 5:51

Performance: Below Average


Problem: Other problem

Description: 

Won’t start up with both RAM sticks installed. Will only start up with one 
RAM stick installed, and even then, the display is dark. I ran EtreCheck by 
using TeamViewer remotely. 


Major Issues:

  Anything that appears on this list needs immediate attention.

  Old operating system - Old operating system versions no longer receive 
security updates.

  Low RAM - This machine has insufficient RAM.

  Obsolete hardware - This machine may be considered obsolete.


Minor Issues:

  These issues do not need immediate attention but they may indicate future 
problems.

  Upgradeable RAM - This machine has upgradeable RAM that would help its 
performance.

  Small backup drive - Time Machine backup drive is too small.

  Unsigned files - There is unsigned software installed. They appear to be 
legitimate but should be reviewed.

  Low performance - EtreCheck report took over 5 minutes to run. This is 
unusual.

  32-bit Apps - This machine has 32-bits apps that may have problems in the 
future.


Hardware Information:

  iMac (24-inch, Early 2008) - Obsolete!

  iMac Model: iMac8,1

  1 2.8 GHz Intel Core 2 Duo (Duo) CPU: 2-core

  2 RAM Upgradeable

    BANK 0/DIMM0

      2 GB DDR2 SDRAM 800  ok

    BANK 1/DIMM1

      Empty    

Video Information:

  Unknown

    Display 1280 x 1024 @ 60 Hz


Drives:

  disk0 - Hitachi HDP725032GLA380 320.07 GB (Mechanical) 

  Internal SATA 3 Gigabit Serial ATA

    disk0s1 - EFI [EFI] 210 MB

    disk0s2 - Macintosh HD (Journaled HFS+) 319.21 GB

    disk0s3 - Recovery HD [Recovery] 650 MB


  disk1 - SuperDrive 4.94 GB (Unknown) 

  Internal ATAPI


  disk2 - Lexar USB Flash Drive Media 16.00 GB (Unknown) 

  External USB


Mounted Volumes:

  disk0s2 - Macintosh HD 319.21 GB (296.40 GB free)

  Journaled HFS+

  Mount point: /

  

  disk1s3 - A***********************c 4.94 GB (84 MB free)

  HFS+

  Mount point: /Volumes/Applications Install Disc

  

  disk2s1 - I*******************e 16.00 GB (10.22 GB free)

  Journaled HFS+

  Mount point: /Volumes/Install OS X Yosemite

  

Network:

  Interface Bluetooth-Modem: Bluetooth DUN

  Interface en0: Ethernet

    One IPv4 address

  Interface fw0: FireWire

  Interface en1: Wi-Fi

    802.11 a/b/g/n

    One IPv4 address

  Interface en2: Bluetooth PAN


System Software:

  OS X Yosemite 10.10.5 (14F2511) 

  Time since boot: About an hour

  System Load: 1.73 (1 min ago) 1.79 (5 min ago) 1.80 (15 min ago)


Security:

  System                       Status

  Gatekeeper                   Mac App Store and identified developers



Unsigned Files:

  Launchd: /Library/LaunchAgents/org.chromium.chromoting.plist

    Executable: 
/Library/PrivilegedHelperTools/org.chromium.chromoting.me2me.sh 
--run-from-launchd

    Details: Exact match found in the whitelist - probably OK


32-bit Applications:

  10 32-bit apps


Kernel Extensions:

  /Library/Extensions

    [Loaded]     SophosFileProtection.kext (9.7.4 - SDK 10.12)

    [Loaded]     SophosWebProtection.kext (9.7.4 - SDK 10.12)


System Launch Agents:

  [Not Loaded]  5 Apple tasks

  [Loaded]      164 Apple tasks

  [Running]     43 Apple tasks


System Launch Daemons:

  [Not Loaded]  45 Apple tasks

  [Loaded]      147 Apple tasks

  [Running]     70 Apple tasks


Launch Agents:

  [Running]    com.teamviewer.teamviewer_desktop.plist (TeamViewer GmbH - 
installed 2018-03-31)

  [Running]    com.teamviewer.teamviewer.plist (TeamViewer GmbH - installed 
2018-03-31)

  [Running]    com.sophos.home.ui.plist (Sophos - installed 2018-03-08)

  [Loaded]     com.google.keystone.agent.plist (Google, Inc. - installed 
2018-03-22)

  [Running]    com.sophos.agent.plist (Sophos - installed 2018-03-08)

  [Running]    org.chromium.chromoting.plist (? 81572da9  - installed 
2018-03-06)


Launch Daemons:

  [Running]    com.teamviewer.teamviewer_service.plist (TeamViewer GmbH - 
installed 2018-03-31)

  [Loaded]     com.teamviewer.Helper.plist (TeamViewer GmbH - installed 
2018-03-20)

  [Loaded]     com.adobe.fpsaud.plist (Adobe Systems, Inc. - installed 
2018-02-23)

  [Loaded]     com.google.keystone.daemon.plist (Google, Inc. - installed 
2018-03-22)

  [Running]    com.sophos.common.servicemanager.plist (Sophos - installed 
2018-03-08)


User Login Items:

  iTunesHelper Application (Apple, Inc. - installed 2018-01-25)

     (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)

  Jacquie Lawson Quick Send Widget 2017 Application

     (/Applications/Jacquie Lawson Quick Send Widget 2017.app)


Internet Plug-ins:

  DirectorShockwave: 12.2.5r195 (installed 2016-09-01)

  QuickTime Plugin: 7.7.3 (installed 2017-11-26)

  Flash Player: 29.0.0.113 (installed 2018-03-17)

  FlashPlayer-10.6: 29.0.0.113 (installed 2018-03-17)

  Default Browser: 600 (installed 2015-07-16)


3rd Party Preference Panes:

  Flash Player (installed 2018-02-23)


Time Machine:

  Skip System Files: 

  Mobile backups: 

  Auto backup: Yes

  Volumes being backed up: 

    Macintosh HD: Disk size: 319.21 GB - Disk used: 22.81 GB 

  Destinations: 

    T******************s [Local] (Last used)

      Total size: 32.12 GB

      Total number of backups: 3

      Oldest backup: 2018-03-18 01:03:53

      Last backup: 2018-03-22 20:25:43


Top Processes by CPU:

  Process (count)     Source             % of CPU

  WindowServer        Apple                   17 

  TeamViewer_Desktop  TeamViewer GmbH         16 

  mds                 Apple                   10 

  mdworker (6)        Apple                    4 

  TeamViewer_Service  TeamViewer GmbH          2 


Top Processes by Memory:

  Process (count)     Source             RAM usage

  kernel_task         Apple                 208 MB

  TeamViewer_Desktop  TeamViewer GmbH       166 MB

  SophosScanD                               114 MB

  soffice                                   113 MB

  WindowServer        Apple                  56 MB


Top Processes by Energy Use:

  Process (count)     Source           Energy usage (0-100)

  WindowServer        Apple            10

  TeamViewer_Desktop  TeamViewer GmbH  8

  TeamViewer_Service  TeamViewer GmbH  1

  launchd             Apple            0

  TeamViewer          TeamViewer GmbH  0


Virtual Memory Information:

  Available RAM    653 MB

  Free RAM          15 MB

  Used RAM        1.36 GB

  Cached files     638 MB

  Swap Used         21 MB


Software Installs (past 30 days):

  Name        Version    Install Date

  TeamViewer  13.1.2991  2018-03-22


Diagnostics Information (past 7 days):

  2018-03-31 18:38:35 Last Shutdown Cause: 0 - Power loss (once)

  2018-03-26 19:10:20 storeassetd CPU (once)

  2018-03-26 19:08:57 remoting_me2me_host Crash (once)


End of report


On Monday, March 26, 2018 at 8:27:21 PM UTC-6, [email protected] wrote:
>
> Hi all,
> My mom's 2008 iMac with Yosemite and 4 GB RAM will no longer start. (Sorry 
> that I don't more specs, but it won't start)
> When I push the power button, all I hear is a clicking sound near the 
> optical drive. No startup chime.
>
> What I have tried:
> If I unplug the machine, and remove the two 2GB RAM cards and then try to 
> start, I get the "no RAM present" tone.
> If I then unplug it,  put one of the RAM cards in, and then push the power 
> button, I hear the startup chime, but the screen is dark. 
>
> I have tried booting from a flash drive with Yosemite, and booting from 
> the AHT disk, but to no avail. 
>
> The same thing happened last week, and I kept swapping RAM cards out with 
> some old 1 GB RAM cards from a previous machine. Somehow, it eventually 
> started and the screen came on. 
> I was able to run the Apple Hardware Test, which gave this error: 
> 4MOT/2/40000004:HDD -1392, and a subsequent running of the AHT gave the 
> same error, with -1384 at the end.
>
> After searching the internet, some folks said that the error was a HD fan 
> error. Some suggesting vacuuming as much dust out as possible, which I did. 
> Then I ran the AHT again, and it found no errors. 
> I also ran Disk Utility, which found and corrected permissions errors. It 
> did not indicate other problems. 
>
> The machine worked fine for about a week, but today when I tried to wake 
> it, I got a black and white checked screen. I had to force it to shut down, 
> and now it will not start again. I get the same clicking sound near the 
> optical drive. However, if I pull out one of the RAM cards, I can get a 
> startup chime, but I still have a black screen.
>
> Any thoughts on this issue, or how to troubleshoot it?
> Thanks!
> Joe
>
>

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