Not easily - I have the equipment but the connections are pretty well covered.  
I might have a closer look at it later today.  I also want to check out any 
caps that I can find on the main board.

On Jan 31, 2014, at 8:19 am, John <johnsess...@yahoo.com> wrote:

> Do you have any way to actually check for voltages coming out of the power 
> supply?
> 
> On 1/29/2014 11:19 PM, David Mann wrote:
>> Thanks Zos, you're pretty much saying what I thought.
>> 
>> I took the power supply out earlier today and had a look to see if
>> any caps (or anything at all) had suffered obvious failures but it
>> looked pretty good.  Minimal dust, too but I vacuumed it out, gave
>> things a wiggle and put it all back together with no change in
>> behaviour.
>> 
>> I'm only annoyed because of the scanner.  I'll have to check whether
>> I've scanned all of my 35mm slides.  I scanned the last of my medium
>> format stuff last year.
>> 
>> Cheers, Dave
>> 
>> On Jan 30, 2014, at 2:12 pm, Zos Xavius <zosxav...@gmail.com> wrote:
>> 
>>> It should start up with a bad battery. Your power supply is most
>>> like dead or the caps on the board have failed.
>>> 
>>> On Wed, Jan 29, 2014 at 8:08 PM, David Mann <dmann...@gmail.com>
>>> wrote:
>>>> Hi all,
>>>> 
>>>> I started up my old G5 to do some slide scanning today but it
>>>> seems to be on the blink.  At first I had some strange problems
>>>> communicating with the scanner but it came right and I got a
>>>> couple of scans done.
>>>> 
>>>> I left the machine to idle while I had lunch but when I came back
>>>> it had frozen up and I had to hold the power button down to get
>>>> it to shut down.
>>>> 
>>>> Now it won't start up :(  The fans and hard drives spin up but
>>>> that's it.  No chime, no signal to the display.  The power LED
>>>> only lights when I press the power button.  I think it was
>>>> lighting up at first, but it stopped after I did the PMU reset
>>>> (see below).
>>>> 
>>>> I've tried re-seating the video card and the memory, tried
>>>> starting it with the hard drives unplugged, and also with a
>>>> different monitor connected to the other port on the video card.
>>>> I'm not able to get it to respond.
>>>> 
>>>> I've tried resetting the PMU / SMU using these instructions, with
>>>> no luck. http://support.apple.com/kb/HT1939
>>>> http://support.apple.com/kb/HT1436
>>>> 
>>>> I also followed the procedure to reset the PRAM but I didn't hold
>>>> much hope. http://support.apple.com/kb/HT1379
>>>> 
>>>> I'm now at the conclusion that the power supply is probably
>>>> faulty.  Do any of our resident Mac experts have any further
>>>> suggestions?  It's a first-gen single-processor 1.6GHz G5.  I
>>>> just checked and it's just a couple of weeks over 10 years old!
>>>> 
>>>> I've wondered if it would be worth replacing the battery on the
>>>> motherboard but I'm not really sure.
>>>> 
>>>> I've only kept that machine around because it has no resale value
>>>> and Minolta didn't release drivers for later OS versions because
>>>> they exited the scanner business.  I couldn't stand Vuescan when
>>>> I last tried it so I don't really want to go down that route.  I
>>>> guess the good thing about it having no resale value is that I
>>>> can replace it cheaply through the secondhand market.
>>>> 
>>>> Unfortunately I was just getting started on a project to scan
>>>> some really old glass-plate slides for someone :(  Might have to
>>>> resort to a macro lens and a light box.
>>>> 
>>>> Cheers, Dave
> 
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