No video signal and wierd noises

I put together a new system with the 865pe neo 2 about a week and a half ago. Had to clear the CMOS to get a boot initially but since then the system has worked fine (except for an ongoing problem with com1..).
Last night I loaded UT2003 demo and played it for about 45 minutes then I powered down. This morning I started to get alerts from core centre that the 3.3v was down around 2.9-2.84. Then my video signal started cutting out (screen goes blank for a second) then finally the system froze. I rebooted and checked the bios (I'm using standard boot with no overclocking) As the day went on the system became more and more difficult to boot. At first I could get to the OS but it would quickly freeze. Then I could get into the BIOS but then the screen pixelated and then froze. On occasion the system would show 4 red lights and give me the 2 tone alarm. (Good God I hope its not the CPU) At this time I have no video signal at all. I tried another monitor..no go. I am using a good power supply (Enermax 365P-ve). Now the system POSTs okay but refuses to go any further (still no video though)
Do you think my ATI is toast? How could it just stop working? Does the loss of video card have such an effect on the boot up?
Any thoughts would be appreciated. I am at my wits end.
prouja

No I haven't tried a different power supply. All my other computers are PIII and use ~300W supplies.
I did try the ATI video card in an old computer and it didn't give my any problems so now I am thinking maybe the RAM or as you said the power supply.
Is there any way to test the output of the power supply? I have a digital multitester but I'm not great with it.
Could RAM issues cause the problems I encountered?
As an update the computer now makes 2 long and then 8 short beeps at startup and then hangs at keyboard initialization (as shown by the 4 leds at the back) Of course this started after I tried clearing the CMOS (power off).

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