Computer wont reboot from start menu

[Carl29]

Hi, I've just installed a new motherboard/CPU and, and power supply on my pc, and at the same time i've also installed a new winxp pro installation.
Everything works fine: The only thing is that when I go to "start > turn off" and choose restart; the PC starts to turn off everything just like normal till the blue microsoft windows screen , and then it stays there. Basicaly the pc wont restart, but it turns off normaly when choosing "turn off" .

After inomerous trys I went to the component store and we find out that by removing my old tv tuner from my MO would fix the problem; everything was running great.
I came home, conected my screen, my mouse, and again "it wont reboot"
I really dont understand, it s very weird, the only diference is the my mouse and keyboard, wish are wireless:

What it could be?

thanks

MY CONFIG:

CPU: INTEL CORE DUO E5200 2.5 GH
MO: ASSUS P5QL/EPU
RAM: 2 Gig pc800 DDR2
Video card: ATI RADEON X550 HM RV370 LE 256 MB
HDD : Seagate Barracuda 7200.8 200GB

PSU: COOLBOX powerline FA-500W

OS: Win XP Pro

Bios: Version 0406

[liljim]

theres a couple different things that can cause windows to "hang" on reboot. I will suggest 3 things right off if you havent already done so,

1- update windows with all available updates
2- check for any driver updates.
3- check for any bios updates.