[newbe]

The problem i am having is complicated. So i woke up this morning after going to bed leaving my computer to render a video. When i wake up the monitor won't "wake up". As in it stayed black no matter what button i pressed. I checked the connection...

The problem i am having is complicated. So i woke up this morning after going to bed leaving my computer to render a video. When i wake up the monitor won't "wake up". As in it stayed black no matter what button i pressed. I checked the connection and power and all wer fine. So i rebooted and it worked fine. As it was booting up i get the error "DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER" at this point i'm worried that some ninja attacked my computer at night. So i shut off the comp and wait for about 40 secs and started again, this time it did boot but took an exceptionally long time to do so. Then i tried to open my computer before all the start up items were loaded, this was a mistake, it froze. So i had to force shut it down. Then i start it again get the same error as above and i do the same thing as before to get it to boot up. I ran diagnostics on hdd ram cpu and other things, sorry cant remember what else. All were fine. I also went to system recovery and told it to repair any start up problems, which it did successfully. Then i rebooted, this time it booted fine fast and no problems. I think that i fixed it, but i was wrong. I waited for all the start up items to load and the start to play FoF(remember i thought the prob was fixed). As i am playing a few mins into it it freezes. So then i decided maybe i did something recently. I restored my computer to 2 days before (the 22nd). I recall no problems then. But alas the computer is still freezing. Please help, BTW It froze whille i was writing this post so i had to pull out an old laptop and finish it the computer is currently unusable. Here are my specs.
Manufacturer:
HP-Pavilion
Processor:
Intel(R) Pentium(R) Dual CPU E2220 @ 2.40GHz (2 CPUs), ~2.4GHz
Memory:
4094MB RAM
Hard Drive:
488 GB
Video Card:
Radeon X1900 Series
Monitor:
Generic PnP Monitor
Sound Card:
Speakers (Realtek High Definition Audio)
Speakers/Headphones:
Creative XFi 5.1 Surround Sound
Keyboard:
USB Root Hub
Mouse:
USB Root Hub
Mouse Surface:
Razer DiamondBack 3g
Operating System:
Windows Vista™ Home Premium (6.0, Build 6001) Service Pack 1 (6001.vistasp1_gdr.080917-1612)
Motherboard:
Pheonix