Dos boot up screen keeps restarting?

[Andyk-9]

Hello everyone

I have a few old bits laying around and a family member wanted a computer just for emails, online shopping and facebook so i said i have a few bits hanging around just need a motherboard. So i got a cheap MB from ebay tested and working from a small company..

Now dont laugh when i tell the specs lol..

NEC 945G-M4
Intel Pentium 4 650 sl7z7 3.4ghz
3 x 1GB DDR2 800
bfg nvidia geforce 8800 gts oc2 512mb

1 X Sata 500gb Hard drive
1 x Sata DVD Reader

550wat OCZ PSU

Now after contecting everything, i swithed everything on and the dos boot up screen shown everything i had connected, then it restarted and in a cycle. I can get into the Bios and its fine, i then tried booting from the DVD rom so i can install windows but as soon i press a key to boot from rom drive it just restarts.. If i was to leave it, it will do the same.. Does anyone know what could be causing this?

What i have tried.

Another CPU
Tried using just 1 ram at a time
Took out the GFX card
Tried an IDE Rom and IDE Hard drive

I have never come across this before and its baffeling me..

Has anyone come across this?

Kind Regards

Andy

 

[Andyk-9]

Sorry for a very late reply. It turned out the MB was a fault..