My new computer build won't stay powered on

I had a custom built computer that was running fine until one day the liquid cooling systems pump went out, eventually this caused the computer to over heat and not stay powered on for very long. Eventually the computer would not even stay on long enough to boot up. I decided to remove the liquid cooling system and was going to replace it. However i decided no to and instead I ordered new parts to rebuild the system.

The specs for the original computer were

ASSUS P5N32-SLI Premium motherboard
2 sticks of corsair DDR2 memory
Intel core 2 Extreme CPU
Thermal take 700watt power supply
150GB western digital raptor hard drive
Nvidia Geforce 8600gt graphics card

So for the new system I kept the intel core 2 extreme cpu, the 2 sticks of corsair DDR2 ram, and I replaced the motherboard, Graphics card, and power supply.

The new system specs are

New EVGA NForce 780i SLI FTW motherboard
same 2 sticks of corsair DDR2 memory
same intel core 2 extreme cpu
New 850 watt thermal take power supply
same Raptor 150GB hard drive
New Nvidia e-GEForce 9800 GTX graphics card.


After I assembled the system and turned on the power the leds on the mother board light up. Then when I press the power button on the front of the case all the fans power on and system begins to run, however no signal is displayed on the monitor. I hear some beeps from the mother board and the display for the post codes that built into the motherboard works. The codes change a couple of times and then when it reads the FF code for boot that's about the time everything shuts of., but then after a few more second the system stops, the fans shut off and nothing is running, although the lights on the motherboard are still on. I have tried everything I can think of but can;t seem to get the computer to stay powered on long enough to boot up or display anything on the monitor. Any help or advice would be greatly appreciate , this is making me very frustrated, since I have replaced almost everything I thought could be the cause of the problem and I still cannot get it to boot.

Did you remember the 4/8pin connector for the CPU, and did you remember the GPU power?

Ok update I removed both sticks of memory and powered up the computer and I got the long constant beep, it happened 3 times and then everything powered off just like before. Does that mean the cpu is working or not?

If your last system died, and stopped booting, after your liquid cooling pump died I would guess that you could have possibly burned up your CPU.

Considering that you replaced the motherboard and video card, and things still don't work, I'm willing to bet your CPU is toast. The chances of your memory sticks overheating are pretty slim by comparison. So I kinda doubt that's it.

The fact that you've put this CPU into your old motherboard, and now this new one, and it still won't work, suggests this CPU may indeed be dead. (Though it's possible the mobo could be DOA)

I know it's not a definitive answer, but I'm leaning toward a bad CPU.

I tired powering the computer up with 1 stick of ram in, but I still get the same constant beep as I did when no memory is inserted. I also tried the stick in all four slots.(graphics card is not in at this time)

Would it be possible to take a core 2 duo processor out of a working laptop and see if it would boot my other computer or vise versa and put my extreme into the laptop to test it?

so does anybody think if i get 2 new sticks of ram, that will boot up or is it more likely the cpu. I ask bc the cpu I have is one of the most expensive ones and I really can;t afford to replace it at this time, but I need my computer running again ASAP, bc I have to get some important info off of it