computer shuts down without warning

Does it go through the shutdown sequence, or just shut off?

If it just shuts off, you likely have a hardware problem.
Many mother boards monitor CPU temperature and fan speed, if either falls out of spec, they shut the system down to protect theCPU.
Have the case open, and check the temp on the CPU heatsink the next time it shuts down.

It could also be any of the hardware devices, or the power supply.

Chas

Chas is right, also check the Video card FAN, or let say any FAN inside you System.

I also suspect the power supply. It is the first line of offense from the power company and tends to be forgotten the most. Intermittent surges or drops could be enough to shut down. (or fry)

I have seen an almost-but-not-quite-blown power supply cause this, when temperature rises. But if the fuse is inside the power supply case, don't mess with it unless you really-really-know what you are doing. Buying a power supply is much preferable to "dying to fix it."

Hi and thanks for the suggestions. I tried several of them, but to no avail. Since my computer was still under service contract, I took it back. A new motherboard was put in my computer and it now works fine again.

Thanks again for you suggestions.

Bob

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