Having problems with your Dell Dimension 8400 PC Desktop ?

Dimension 8400 will not boot, very loud fan.

\015 Got me some BIG problems here with my 8400, 40 months old and well out of warranty. For the most part, she has run flawlessly, with the exception of a bad stick of RAM about 6 months ago. I replaced all (4) sticks of DDR2 512mb with (2) new 1gb sticks. All was well until 6 days ago when I got home from work. I hit the power button and got a solid amber power button light and a "rocket ship" for a fan. LoL. I thought the thing was about to fly to the moon. I've never heard a computer fan so loud in my life, it was akin to a vacuum cleaner. I couldn't power off via front button, so I had to pull the AC cord. Upon replacing the cord, unit "took-off" again w/o my pushing the power button. It was a combination of pulling the cord and pushing the button simultaneously before I could get the tower to stay off and be plugged in. When I attempted to start-up again, same rocket ship fan issue. I did get the thing to boot eventually by, again, some funky combination of pulling the AC cord and pushing the power button as well as some "jostling" of the tower. When it did finally start, I kept it running for (6) days while I removed data from it, saving music, pics etc. to an external drive. During the (6) day period it was on, I did re-start on (2) occasions, via Windows, not by turning off and on again. It re-started with no problem. Finally this morning, I turned it off and let it sit while I showered. Upon my return I attempted to turn on and you know it....amber light and rocket ship fan. Once again I was able to get it to boot with the funkiness of pulling, jostling, and punching the button. I have search online for similar issues and have found many with the same problem. It seems that all the others with the same problem have had 87 different ways to fix this. Does anyone have a sure-fire way to remedy this?? I've read about PS, MoBo, CPU, RAM just to name a few. Any help is greatly appriciated!!\015

Answers :

Pc turns on and fan is very load and will not boot what can i do
I own & operate a computer reapair store. I recently worked on a Dimension 8400 that sounded like a jet taking off. I removed the heatsink, cleaned the heatsink & cpu, applied thermal grease & reattached the heat sink. It booted up quietly...after testing it several times...the turbo fan, jet engine sound returned! I removed the heatsink and along the upper part of the cpu I could see where the heatsink hadn't made contact with the cpu! I added more thermal grease & reattached the heatsink. It started fine on several attempts before the jet engine sound returned. I tried applying uppward pressure on the heatsink so it would close the apparent gap between the cpu & heatsink and when I pressed the power button...it started up quietly! At least I identified the source of the problem...not sure how to fix it yet.
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