alright, the other day my pc was working fine with no problems at all. then i left my dorm for a couple hours and i left my pc on as usual. when i came back it was off. so i tried turning it back on, but when i did, it came on but my monitor was saying that the monitor is working but check the cables or something. i checked everything but it still wasnt working. so i checked my video card. still not workin. so i added an old pci card that doesnt really work but it at least lets me see my screen when it boots up. i then checked the bios and everything to see if anything was different. no change. then while it was on the bios i switched and made the agp card the default. i then switch my monitor to the apg card and restarted and it worked. so i pc was running and i was still trying to figure out why it cut off by itself. i did virus check,adaware, and windows update and when i had to restart i did and when it turned off it didnt come back on. i went to press the power button and it turned on for about a sec and it went back off. i opened the case and it seemed pretty hot so i let it cool off for awile to see if it comes back on later. i tried later and it came on. i checked the bios and the temp and the motherboard was around 90 something *F and the cpu was 120 to 130*F i dont really know the norm but the cpu doesnt seem normal. i have to fans in. one blowing out the side and one blowing out the back. so i turned it off and unpluged it and had one of my other fans blowin on the inside overnight. so this morning i went to see if it worked and it turned on it seemed fine but then when i got to the desktop it started to make this weird buzzing type sound from the motherboard. i restarted it and the same thing, it didnt com back on. i just wanted to know if i could get some help cuz i dont want to make anything worse.

You are loosing a fan. Its either the Processor fan or its a case fan. Odds on favorite is the CPU fan. If you CPU is that hot it will be no time before it burns up. CPU temps should not exceed 120 degrees F. Case should not be above 80+- Degrees F. If you are loosing a Fan, it should be making a big racket. You may also have a burning smell where the parts are getting too hot.

OK, now the real question, What is the Make, Model and Processor on this system? We can diagnose better knowing this info. The above paragraph applies to just about any processor, but some will run hotter and be OK, and others will not.

alright, i cleaned everything out. it wasnt much dust. just a liitle in the cpu fan. i waited for a while then i turn it on. i went into the bios and looked and the health monitoring system. when i first looked it said CPU temp= 40*C/104*F and M/B temp= 28*C/82*F. after no less than a minute the CPU went from that to 52*C/125*F. i didnt know if that was normal so i turned it off. is that normal for it to increase to that in that amount of time...? My CPU Model is Intel Celeron 2.20 Ghz

No, that is not normal. Are you hearing any kind of grinding? Dust is part of the problem and you have cleaned that out. The bearing on the fan is the other. Some Intel CPUs shipped with Sleeved bearing fans and some with Ball Bearings. The Sleeve bearings are quiet but die quickly when the bearing surface gets burned.

To check the CPU fan for cooling take one of your case fans and put it so that the air is blown onto the CPU. Watch your CPU temps. If it goes down you CPU fan needs to be replaced. If it stays at about the same temp, then you may have dry or dried up thermal grease and may need replacement/replenishment.

ok, i finally got everything running and it didnt power off byitself and it didnt have very high temps. but after awhile my monitor started to act stupid. the screen went blank and a blue box came up and said the monitor is working but check video and cables. i did. but then as i turn on my pc and monitor the monitor screen displayed the same thing but it was very distorted. i then unpluged the monitor from the pc. it was still distorted and wasnt working. so i had an old pci card(dont know if it works or not but it at least lets me see the bios screen when i boot up) i put it in and tried to see if the monitor worked with that card. it did the same thing.(btw, i had to shut down the pc improperly since i couldnt see anything on the screen everytime) So i just figured the monitor wasnt working anymore. so i was just trying to figure out what i was going to do. i remembered that the new video card i had in, had a s video thing where i could hook my tv up to my pc. i tried that and it worked. my pc booted but it was saying windows was shut down wrong choose how i want to start windows.(i put last known good configuration). now, it seemed to start windows(showed the logo) but then it restarted, it went back to the logo again and restarted again. finally it said windows was shut down wrong again, i chose start normally, it did the same thing, then i chose start in safe mode, it then booted, it worked. so i went to system restore. i did a restore to a coulple days ago. it restarted it wouldnt start windows normally(did same as before). i went to safe mode. it said it system restore incomplete. i tried different dates, same thing happened. i kept trying, i got the blue screen a couple times. so i figured i would just install windows on an extra hard drive i had in my pc. while in safe mode i transfered the files off my extra hard drive to the master and it went fine. i then shut down my pc and went to bed. i wake up this morning and go to class and then i get back to install windows on the hard drive but i turn on my pc and i get a black screen on my tv, the keyboard lights doesnt come on, and i get no beep from my pc. but everything in the pc is powered up and running. i checked everything to make sure it was connected but still the same thing. i could really use some help now. i dont know what to do