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"....Two replies indicated that similar behavior can be caused by bad memory...." ~~~~~ i've seen 4 different 360c's and one 755c experience random rebooting. ibm's initial response was to blame it on the ic dram cards, but swapping them with working laptops, and using ibm's own dram cards proved that the memory was not to blame. it turns out that the dram card sockets on these thinkpads are prone to going bad. the biggest problem with troubleshooting these lockups is that by pulling the dram card out & reseating it, the lockups will go away for a while. after you've reseated it several times and the problem still occurs after a week or so, tech support will have you try a different dram card. well, by pulling out the old one and inserting the new one, you have, again, *temporarily* solved the problem (which may be good enough for them, depending on who answers the phone when you call). it was rough going, but ever since we figured it out, ezserv has been great about replacing the system board when this happens and i haven't had any problems with any of the replacements. the plastic piece that sits underneath the dram cards in the 360 series, and some of the 755 series, doesn't have the half-height frame built onto it to hold the card in place. this frame (which comes in most other 755's i've seen) actually makes it a pain to take out dram cards & probably results in as much stress on the socket as having no frame. ibm did try to fix one of the 360's once by giving us a new plastic piece with this frame on it, to replace the old piece, but the socket had already gone bad, so they ended up swapping the whole board. in any case, the 755c has the frame & still had the same lockup problem, solved by a new system board. Michael J. Verne michael_verne@vmedia.com Systems Analyst, Ventana Communications Group, Inc.