ASUS P5Q PRO SHUTDOWN PROBLEM

After a fresh install of a Vista 32 ult. everything seemed to work fine untill I get to shut down the computer, the screen freezed on a half fading, hdd went off but mb power and fans keeps runing. Started investigating with turning options on or off in bios and vista, nothing changed. Finaly noticed that computer runs ok with only one ram module only, Tried to swap positions of the mem banks but nothing. Tried memtest86+; modules are ok one by one, but both together memtest fails to finish, it keeps reseting.

By the way:
-Asus P5Q PRO (bios 2002)
-E8400 @ 3.00 BOX
-CORSAIR "TWIN2X4096-6400C5 G" 2X2=4Gigs
-ASUS EAH HD4850 512
-SEAGATE 640GB "ST3640323AS"
-PSU COOLER MASTER M520

If anyone have expirienced such issue, and find a sollution or have ANY idea, please post a reply. TNX

I will, as soon as I get home, I'm at work right now, I think those values were set to auto in the bios. I will post the results later.

So now memtest86+ runs successfully, but the computer still hangs on shutdown? Do you have the shutdown button set to actually shut down or sleep? It almost seems like your computer is just going into S1 sleep mode which will still run some fans. Does your computer wake up if you press the mouse button or press a button on the keyboard?

Thanks Oceanian, my problem definitly went away, and it was the clock of the ram. By the way I tryed the things U said, and many others before I get to this. I tought that it would not matter the different clocks of the processor and ram. Now my vista runs ok. Maybe some day I'll turn both the ram and the proccesor to run on 400mhz and then will get 9clk x 400mhz = 3.6ghz and full support of ddr running on 800mhz. But then i would need to get a new heatsink other than the box i have.