System rebuild..need help plz!!

Hi, I recently had my Emachine mobo fry on me. I went ahead and bought the Foxconn MB-K7S741GxMG-GL mobo as it was compatible with the Ram i was using in my previous board. I also preferred it as my old board only had PCI and NO AGP(i know..the suxors). I also got the AMD 3200 to go with it. At boot up, it doesn't seem like my monitor is picking up a signal. I hear the beep when i turn it on. Everything seems to running great except for the front fan at the front of my new tower.

My question is: Since my old OS was running on a Intel Celeron cpu and mobo..will i need to reload windows into my HD in order to function or can i just keep my old OS? Is the problem something else? I was told by a friend that i MAY need to reload my XP onto my HD, but i haven't even received a BIOS screen upon loadup on my rig. Any help would be greatly appreciated. Thank you!