Hi, I just bought a new P965 board with cpu and memory, now the problem is when i push the startbutton everything powers up normaly for about 1/4 of a second then everything shuts down and after 3 - 5 seconds it all starts up again and, i get past post and get the bios beep witch is very weak and then windows boot as normaly and all is fine, what could be the startup problem? there is no overheating all the temperatures are low

my spec
Aerocool ExtremEngine 3T
Intel E6600
MSI P965 Platinum
DDR2 Corsair Dominator TWIN2X6400C4D 2048MB
ATI PowerColor Radeon X1950PRO 256MB
Power Supply Cooltek CT 600
IDE DVD rom
SATA 4 discs

It must be your power supply.
You might want to consider one of these:

Top Tier PSU:
http://www.xtremesystems.org/forum [...] p?t=108088

Silent PSUs
http://www.silentpcreview.com/article699-page1.html

My Cooltek CT 600 is among Tier2 on the Top Tier PSU
http://www.xtremesystems.org/forum [...] p?t=108088

it got power enough +5v got 25A and all 4 +12v got 20A, all reviews i have found they say it a top model and its very good.
That would then be if there is something wrong with the one i bought maybe, any other suggestions?

I had the same problem. Try removing the hdd led...just leave the power and reset button on the mobo. Also when i had them on, i had a pretty slow boot up.

I only have the Power switch , Reset switch and the Speaker connected.
Also the bios beep trough the speaker is just about a weak half beep just sounds strange.

I had a prob with my E6600/AB9 Pro combo. It ran fine stock, but wouldn't OC with my 7800 GTX card. Switched out to a 7600 GS card(no 6 pin connector) and it would OC fine to 400 mhz. Switched out the PSU from an Enermax 600W unit(2 years old) to an Antec TP 650W Trio and no probs now. I guess I was overloading one of the rails.

You might have the same issue, but worse. It may need to heat up a bit to get barely passable power. Try a different PSU.

Now i borrowed an Thermaltake Purepower 680 and tested, but i get the same problem, and i have nothing overclocked so i bet that rules out the PSU.

I'm pretty sure this motherboard just does this, and is normal. It happens to me all the time, but causes no problems, and I've seen many other people report this, with no solution.

Someone posted this at the MSI boards. Have not tested it.

"It seems that the default/flashed BIOS settings in the wake on lan settings, 2 options are enabled, the Resume on PCI and Resume on PCI-E. It looks that this does not work good (I believe) with PSUs that sustain some power to the motherboard after a shut down. The switch on and off variance is now off."

Try using the diagnostics leds that came with the pc. They are very useful. Maybe there is a hardware failure.

I run the same board and have had something similar happen.
It will do what you describe only after I change my overclock and reboot.
If it does that every time you boot, RMA the MB and see if it still does it.