Mac pro no boot sound, black screen and loud fans

Hi everyone,
I've had problems with my Mac for a while now. First of all, it indicated ram problems with 2 beeps. I later fixed this by moving and changing around modules. It was solved, but now a new problem. The Mac seems to turn on, making its iconic sound for startup, but the screen remains black. After about a half to one minute, the fans go crazy and I have to shut it off. I've tried a few things like holding shift or alt, but that doesn't work as it doesn't even display a white screen.
I need to know what to do and I don't really have the time to buy new parts right now. I'm really a windows based pc fixer by the way so I'm new to fixing macs.
Thanks in advance.

Ah OK, a PowerMac G5.
Have you blown the dust out lately?
Boot off your *original* G5 Install Disk while holding down Option/alt key to select AHT, then run the extended Apple Hardware Test.
If you're sure the RAM is good, try the Hair Dryer trick...
http://discussions.apple.com/message.jspa?messageID=13240047#13240047
https://discussions.apple.com/message/15223603#15223603
https://discussions.apple.com/message/15499912#15499912
https://discussions.apple.com/message/15613068#15613068
https://discussions.apple.com/thread/3270112
https://discussions.apple.com/message/16053892#16053892
No power light at all...
https://discussions.apple.com/thread/3692775?tstart=0
It can show on any G5, and even many other computers & electronic devices of the period.
http://www.macintouch.com/reliability/pmg5.html
http://lowendmac.com/ppc/power-macintosh-g5.html
And see this last one in particular...
https://discussions.apple.com/message/16781690#16781690
Heat gun better...
https://discussions.apple.com/thread/3916312?tstart=0

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Shutdown cause 110 is always a thermal problem, which means that your power supply has bitten the dust. It needs replacing, and hopefully, that will be all you need. If you are handy, go to [http://www.jimwarholic.com/2008/07/how-to-repair-apple-imac-g5.php] for instructions on replacing it.
Message was edited by: MGW

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Hello. Try resetting the PRAM and SMC first.
http://support.apple.com/kb/ht3964
http://support.apple.com/kb/ht1379

Mac pro no boot sound, black screen and loud fans

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