A couple of weeks ago, my trusty IBM T22 would occasionally lock up and freeze to the point that the only way I could shut down and restart the machine was to hold down the power button. I suspected that the CPU was getting too hot. I cleaned the fan which wasn't very dirty, and made sure I had good air circulation. The last time it locked up, I was able to power it down, but it is now dead. When I push the power button, the hard drive light flashes and goes out. Nothing else comes up, the hard drive doesn't spin up; the startup screen doesn't appear, no beeps or sound, nothing at all. I suspect the CPU, but before I lay out $75 for a refurbished CPU, I'd like to at least verify that this, and not the PSU, for example, is the problem. Can anyone help me further diagnose this problem before I start replacing parts? My main battery is fine, the CMOS battery reads over 3v open circuit, every thing was working just prior to lockup.