Not booting Windows

[fire_munki]

I've got the system in my sig below bar the gfx as its back with OcUK for testing.
So I though I'll run it from the onboard gfx, started POST with a display. Unit then say starting operating system and reboots.

So using a spare HDD thought I'll install W7 again incase it doesn't like the change, can see everything during the install, make my user name and what not, it then restarts and reboots, gets to the loading o/s note and restarts again.
I don't think its the h/w as I've booted off a ubuntu live CD which loaded up and got me on the web.

Any ideas?

 

[JustBen]

as soon as it pasts post keep pressing f8 and disable automatic restart, now instead of it rebooting it'll stay at the error screen detailing the error.

 

[fire_munki]

Will try after the gym tonight. Ta

 

[fire_munki]

Nope, can't get the F8 menu. Can vid what happens but essentially it loops back straight after saying loading operating system.