Ken wrote:
Picked one of these today and brought it home to play with (for $5.00, why not?!).
$5.00, why not indeed? :)
Opened it up and found two hard drives, both unplugged. One has an Apple sticker, the other does not. The Apple drive is a Quantum ProDrive, 230MB. The other is a Seagate Lightning of unknown capacity. Plugged them both back into the SCSI buss and power and powered it up. Both drives click and whir, but there is no boot chime. Unplugged the "unknown" drive and tried another boot. Same result. Unplugged both drives. Only the power supply fan.
Can you test the PSU's output?
Llets not worry about the drives for a moment. Every mac should bring up a floppy icon with a '?' if no media with system folder is found. Hopefully someone will correct me if this is not the case. With that in mind unplug all of the scsi devices.
Have you tried a boot disk?
http://home.earthlink.net/~gamba2/bootdisks.html
Had it connected to an Apple 15" MultiScan monitor. No picture at all, not even a bright screen.
I guess there is no "thruuump" sound as the display is started. Without being a smartarse, the monitor is on and powered?
Pulled logic board and reseated all RAM. Pulled dead PRAM battery, waited 15 min and installed good battery.
Pulling the battery while the unit has a mains connection is a self defeating test. In some cases (ppc is my only experience so far) the mains and battery should be removed for a time to completely clear some pram corruption..
Reassembled machine. Connected both hard drives. Tried a boot. Nothing but clicks and whirs.
Disconnected both hard drives. Tried again. Same result.
Any logical suggestions?
To check for a failing power supply I would try disconnecting power to all scsi devices. Remove all but 8mb of ram. Remove any expanded vram as there is 1mb on board, any cache card if one is installed and any nubus cards then try to boot of any floppy you have laying around. If the floppy is spat out because it is either not a mac disk or if you hear the floppy churning away looking for a system folder atleast you know some part of the machine is going through its boot process, from this point you have something to work from. A multi meter may do a better job but this covers a few more bases with one stroke.
The pram should be reset with the mains and battery out for a length of time (overnight fixed my 7300)
The lack of any boot chime puzzles me. Checked speaker connections. Appear good.
I know what you mean, the AV monitor I have kills the startup chime. Since you have had the board out have you noticed any staining on the board around the capasitors?
I hope that gives you something to try out and appears slightly logical. ;)
Best of luck, a $5 840av would be a very nice pickup.
Cheers
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