I have a 3 year old IBM R50e with the original battery. About a month ago, I noticed that the screen would freeze (no mouse movement, not even CNTL-ALT-DEL) if I pulled out the AC power cord in the middle of operation. The only way to get the PC back to normal operation is to re-insert the AC power cord and power the PC on again. I replaced the battery ($70 !) but the symptom did not change. A Lenovo repair is out of the question as they want hundreds of $'s just to look at it. Any ideas what the problem might be ?
should be a power regulator issue. Usualy all power supply has a high end SMD capacitor which stores charge which is enough for a temporary out of power in microseconds to miliseconds. If it is faulty it cannot hold charge or cannot discharge enough power. So when you unplug the AC power the discharge from the capacitor is not enough to keep the components in function.
You need to take it to service center. Only a laptop technician with high skills can troubleshoot this.
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