OS Not Booting

by Shubham
(Delhi, INDIA)

I had a previously working custom built system which was built with the following – (P4 3.0-631 HT cpu with a gigabyte 865 mobo).

Now the system won't boot into the OS. I went on to re-format the hard drive, then re-install the OS. Everything seemed fine, past the POST then it finished going through bios loading but stopped there and did not load the OS at all.

Got a brief "NO SIGNAL" on the display but that's it - no video. Is there a way to boot from another partition? Since I did format the C partition could I now boot into the OS from another drive like the drive E for instance?

Any advice?