G5 startup won't get past White Screen, fans blow loud.

I have a G5 single 1.8GHz (late 2005 model?) serial number YM439*QYT
It gets stuck on the White Screen at startup. A minute later the fans start to blow really loud and it just keeps doing that and does not boot up.
I was using a hard drive that was copied from the original drive. So I put the original drive in and it was fine for a day. Now the computer is doing the same thing at startup with the original drive, as explained above.
I reset PRAM & NVRAM, nothing.
I have two different video cards, that's not the issue.
I do not have the OS Install Disc as this computer was given to me as a gift.
Any suggestions? Thanks.
<Edited by Host>

OK, from http://www.chipmunk.nl/klantenservice/applemodel.html
here is your system description:
Serial number: YM439*QYT
Name: PowerMac G5 (Late 2004)
Group1: PowerMac
Group2: G5
Generation: 3
ModelCode: g5june04
CPU speed: 1.8GHz
Memory - number of slots: 4
When you say white screen, are you talking about the gray screen with the apple in the middle? Do you see the progress gear at all before it stalls? Have you done a safe boot to force the fsck operation? You can also do a verbose boot (hold down cmd-V combination at power up and watch for dumb terminal output with Unix messages similar to what you see in the system log). Verbose booting might give you more information about where the stall is actually occurring, if it is stalling after the point where the terminal display begins.
Lots of voodoo in these situations, because there are lots of individual failures that can cause the problem.

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Model Identifier: MacBookPro5,1
Processor Name: Intel Core 2 Duo
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0x51383e98 : 0x47f5ad (0x5cf950 0x831c08 0xd 0x0)
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0x51383f68 : 0x219432 (0x72b7b7c 0xffffff7f 0x51383f88 0x2a45c9)
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Message was edited by: kostby

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