Customer's Dell 4400 tower boots normally when cold then shuts down 2 to 3 minutes into run, usually just after XP comes up. Total sudden shut down, however, MB light stays on and on/off toggle switch becomes inoperative. Fans (P.Supply & case) run until the shut down and stop along with HDD. A second or third attempt to boot while still warm from prev. boot are useless, fans come on and HDD kicks in for 1 or 2 seconds, then everything shuts down before OS starts. Wait 15 min. or so, and it starts and runs for 1-3 min. thens shuts down again. Replaced power supply with known good unit, no change! Replaced CMOS battery, no change! Reseated all cables, no change! While running all lights on back of case are on and green, everything is up, but just briefly. All drives start on POST.
Customer says machine ran two days ago and started yesterday twice then went into above condition where it remains! I'm thinking MB problem, any thoughts? We've had a few severe electrical storms in this area over the past week, no evidence of surge burnout, other than this problem. HDD runs fine when hooked to another machine via Sabrent kit.
Edited by GR the computer guy, 03 July 2013 - 09:32 PM.