P5K won't POST after clearing CMOS

[VERTIGGO]

I just installed my rig in sig this week and was overclocking easily to 3500MHz with 1.456V and never going above 47C. The ram (Mushkin DDR2 800) was running at 774MHz I believe. Orthos was stable for about 9 hours.

Then I switched to 440 x 8 with ram at 880MHz and 2.2V for better mem performance. Now Orthos still ran for 8 hours stable, but when I woke up, and tried to stop the benchmark and jump on the internet, windows went crazy, firefox wouldn't open (initialization errors) so I restarted. It wouldn't boot however, and the Bad BIOS checksum came up (I'm using 0404). It went through the cycle where it looks for .ROM files, and finally found the windows dvd and said it was loaded successfully. However, when I rebooted it kept doing the same thi.ng... reloading the BIOS. So I cleared the CMOS, and then tried to power up and now I get nothing but lights and fans. No beep no post no display.
Should I keep messing with it or just try to RMA as soon as possible. (I ordered it only 2 weeks ago, so I should be within the timeframe)

 

[VERTIGGO]

Even more trouble, when I swapped back to my A8N32 setup, i get post beeps: 1 long 3 short which is no extended graphics. My old video card works fine so now that means my HD2900 is burned out! How is this possible my A8R32 burned out, now my P5k brand new and my HD2900 all within a month. Is this a bad power supply or something? What could be wrecking my system from the inside?


I was getting PC Probe alarm messages on the voltages earlier, but I couldn't tell if it was up or down or what.

 

[Don66]

Check your power supply.

 

[VERTIGGO]

That's my guess, but how? And I've had no problems whatsoever with the Turbo Cool, the problems all started with the Thermaltake graphics PSU. The fishy thing is that the 3.3V line had a warning as well and the Thermaltake only connects to the system through the PCI-E auxilliary plugs, which are all 12V. How could adding this unit mess with the motherboard and the rest of the system? Could it have burned through everything and damaged the main PSU as well?