MS-6368 (OEM by Compaq) may died

Dear Expert:

My Computer does not start anymore.

I did an fresh install of Windows XP Home, installed Windows updates and driver updates.
I restarted the system and everything was been fine.

At last I deactivated the onboard TridentBlade graphic chipset via Hardware Manager. (like it was been before)
Because I'm using a GeForce2 MX400 @ PCi. (is working since a year in this PC)

Well, I had to restart the system and now I just get an Error Code by the mainboard speaker.

It's an continuous short bleep and it doesn't stop until I switch of the PC.
BIOS is made by Award. And so far I know, the Error Code is saying there is a problem with energy supply of mainboard.
I have no idea what happen, I tried also another PowerSupply of a working PC. But still no joy.
Even the screen keeps black.

Any ideas? :-S

Thanks in advance.
tourajamAsked:
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CallandorConnect With a Mentor Commented:
Not much left to try.  There's a chance the second power supply is not working, but if it came from a working system, that would not be the case.  Any other video card to try, in case the onboard is bad and the MX400 is also bad?  You can also try the motherboard outside the case on a cardboard box, but if that doesn't work, the motherboard may have gone bad.
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CallandorCommented:
Perhaps it thinks your MX400 video card is no good - reset the BIOS and run from your onboard video card again.  If that doesn't work, try swapping the memory modules for ones that you know work.
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tourajamAuthor Commented:
Thanks for reply,

Well, I tried minimal configuration(no hdd, optical drives and floppy, memoved PCi modem). I removed every hardware, started just with one memory module. (I tried both)
Nothing changed, the screen keeps black. (using onboard chipset).

Just the Error Code starts 1-2 seconds later now. :(
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tourajamAuthor Commented:
The bad thing is I can't try another videocard. It's not possible to disable the onboard graphic by BIOS because of used Chipset. (I've checked the mainboard manual)

So, I could install any PCi videocard, the board would boot with the onboard one. But WinXP is swapping to the PCi one then. I'm just be able to get a boot screen if screen is connected to onboard vga.

Maybe your are right about the bad motherboard. :/
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FriarTukConnect With a Mentor Commented:
do you have an agp port & an agp vidcrd to try?

also go to your mfg's website, then download & install an updated bios flash
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