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My cpu was overheating due to a failed cpu fan. I think the temperature must have climbed to around 75° before I shut the computer off for a couple minutes. When I turned it back on, everything seemed fine, but my network card wasn't communicating with my cable modem anymore. I have a secondary network card in the same computer which I connected to the modem, and it works fine. Could the other network card (which is connected via a PCI slot) be fried because of the CPU overheating??

Well, the fact that it just did is a confirmation that it can happen. Explaining why it did is something that miffs me. It may sound redundant but have you tried the "fried" network card in another PCI slot or in another PC and what kind of card (spec) is it ?

Well, of course if your CPU overheats all things are possible. Were you overclocking it as well? That's double trouble.
You can avoid many of these Windows problems with Linux. Linspire eases the transition for new users

You saved me from buying a network card, Sabertooth. I tried plugging it in another PCI slot and it works fine now. Looks like it was the PCI slot itself that got fried. I wonder what else was affected? Fortunately, I wasn't overclocking.
Thanks!

Unfortunately, you may need a new motherboard!
You can avoid many of these Windows problems with Linux. Linspire eases the transition for new users

Yeah, that's my main concern. Fortunately this computer is about 4 years old already, and will be replaced soon. I don't know how I'm going to determine if the motherboard needs replacing. Everything seems to be working fine so far...

Well, I was wondering what else would be affected by cpu overheating...
Now I'm having problems with my hard drive! The power to the drive seems to be cutting out intermittently whenever it's doing any heavy data transfer. I hear a click, the light goes out, the drive spins down, then a half second to a second later, I hear another click, light goes back on, and the drive spins up. Also, I notice a slight gritty sound when the drive is accessing data, which wasn't there before. Fortunatly, there hasn't been any data loss, and I'm wondering if it would be possible to lose any data if this turns out to be another motherboard problem.
I had replaced the cpu fan, and everything seemed kosher until I decided to surf MTV's java-heavy website. I was waiting for a music video to load and the motherboard alarm went off again (just a constant beep). The cpu fan was running fine, and I'm sure I installed it the right way. I reset the computer, and that's when I noticed this new problem with my hard drive. I was surprised the alarm went off again.. what else would cause that?

Why don't you back up your data, because when your drive goes out, as it seems likely now, you won;t have another heartbreak.
You can avoid many of these Windows problems with Linux. Linspire eases the transition for new users

you may also be having problems with your PSU try another one and see if it will fix the problem if not i would say you MOB is toasted
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