I'm currently working on a friend's portable (Acer Travelmate 291LCi to be exact). The problem is that this system simply shuts down and starts to reboot after no specific time frame. My friend already got the MB changed under warranty (so acer claims), but the problem re-occurs. Now, the portable is under my care and I've already cleaned it out completely, changed the cpu cooling gel which was in need of a replacement. I then was able to get into the system and work for about 10 minz, but then it failed on me.
I then took a harder look on the RAM (2x256Mb), and tried to boot it up, just using one piece, but that didn't do much good. I haven't tried fresh RAM yet, since I just got the system
The current situation is that I can boot it up, get into windows, work for some time (15 minz max!) and then the rebootingprocess starts. Any ideas?