My computer randomly shut down

If you're using Windows XP Profesionnal, click Start -> All Programs -> Administrative Tools -> Event Viewer. Then, look through both Application and System logs, to see whether it's a specific program or system error causing the computer to shut down.

Jam it back in, in the dark.

Sir VG is right, it's best not to use a vacuum cleaner inside a computer. The best method is to use compressed air, but I've been told that a handheld cleaner that blows air works too.

Have you checked to see if its a program causing the crash?

There's nowhere I can't reach.

Originally Posted by Omnislash124

What? 86 degrees Celcius? God Damn....Isn't the CPU Threshold Temp like 85C or 90C? Damn....

It depends on the processor itself; older CPUs generally have a much higher maximum temperature threshold. Although running at such high temperatures will definitely cut the CPUs lifespan.

You could try and maintain a positive case pressure (more air being pulled in than pushed out) which should stop dirty air being pulled into the case through small gaps.

How ya doing, buddy?