Computer almost caught fire

So, about a few months ago, I switched computer towers and I had no external issues until about two weeks ago. My computer was on for a few hours in sleep mode. I smelled plastic burning a few minutes after I took it out of sleep mode so I quickly shut it off and found that it was coming from my hard drive. There wasn't any damage on the outside so I waited a little bit and then tried a different hard drive. Within seconds of me turning it on, smoking started coming from my computer. I once again, quickly turned it off. My hard drive had fallen onto my graphics card and a small part of my graphics card and hard drive is burnt. I'm not sure what could be causing this.

My computer is older and was given to me by a friend who built it. I'm going to need my computer again soon.

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Clarification Request
You seemed to write the cause.

You write "My hard drive had fallen onto my graphics card and a small part of my graphics card and hard drive is burnt. I'm not sure what could be causing this."

That seems quite clear to me. Was there a question beyond that one?

In the future, make your questions clear and end them with the question mark. Your title doesn't lead with what I'm guessing is "How do I repair PCs?"

To that you replace the failed parts. It is sadly that simple. Google "The Dead PC" if you need more background on repairing dead PCs.

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Recheck your work...

You stated you swapped "towers" and thus may have introduced a problem. It maybe an unwanted mounting post in contact where it shouldn't be. -OR- if you re-used older parts something gave out too quickly under stress or similar. Basically, I suggest you remove everything out of the case, place on cardboard or non-metallic surface, connect and test again. You could start with the simplest PC setup as possible and add-on if tests OK. Otherwise, check the case itself as all mounting aren't used, just verify against the mtrbd. and posts due align or *all* are proper, don't take it for granted. These are basic checks but your power-ON results to different HDs offers that maybe the power lead could be at fault, thus try another PSU of capable watts and go from there. Again, all on cardboard and of course check for flames because cardboard burns well. Your burning results are common to some mishap of assembly and is rare to happen after a PC been working for some time, thus your swapping is in question.

tada -----Willy Happy

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