Thinkcentre M93 reboots itself.
For the first time this computer, 12 years old, rebooted itself, twice within a few minutes. I took off the top and put my box fan blowing on it. It's been good for the last 2 hours. What's the likeliest problem? Power supply? CPU? RAM? I have 16 GB RAM, never use that much, could take some out. If it's the SSD I could take out the CD on top of it if that would improve its cooling. I cleaned it thoroughly a week ago so there's no dust. I know I should get a new computer, so don't bother to tell me that.