Windows won't boot after systems restore

Hey guys,

Okay, so here is the deal. My computer was starting to run sluggish and I'm pretty sure it's due to a virus, anyway I did a system restore as I saw that was my last option. Anyway I went through the whole procedure. I waited for the computer to restart but it didn't. Now whenever I try to turn it on the monitor says "no signal" the pc turns on and everything, I've tried unplugging and replugging, also took out the small round battery but no luck. I'm at loss, any help or suggestions? Thanks in advance for replies, it means a lot