A few months ago my Profile 5.5 would randomly shut down, sometimes putting a fan error message on the screen. I opened the computer and cleaned the heat sink. The problem went away for a couple months, then started happening again. I opened it up and cleaned the heat sink again, but this time it wasn't very dusty. The power supply still puts out 12.1V with no load, but I haven't had a chance to probe it inside the computer to see if it's dropping under load.
The fans still run. I tried to boot up in safe mode, but that didn't work.
It's real hit or miss getting it to run for any length of time. I'm not confident I can get it running long enough for virus or spyware scans.
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you can use the unit without the battery. Remove the battery, plug in the charger/power supply and turn on the unit and wait for the result. if the problem persist?..... maybe the fault is in CPU fan. check the fan...overheating the processor. Cleaning the heat sync and reapplying silicon compound on CPU's can cure the problem.
Make sure you don't have any unecessary programs loading up into windows when your laptop boots up. The next time the system randomly reboots check to see if the laptop feels a bit warmer then normal. Could be that your air vents are being blocked by dust. That would cause the air not to flow properly. Take a can of air and blow the vents clear so the air can flow properly and that would take care of the problem.
I just had a machine in the other day with the exact problem you describe. Don't know if this will help but they had a worm and when the anti-virus kicked in or they opened any type of online program like a broswer or email the computer would shut down.
Also hardware could be the issue. If its not the above issue could you tell us when the last time the heatsink was cleaned. What if anything your doing when it shuts down....
Check the CPU and Fan/Heatsink assembly. I have a pretty good feeling that the CPU is heating up too much and is not being cooled properly. There may be lint or dust clogged in the fan. You can get access to this pretty easy by removing a few screws on the bottom panel that houses the CPU/fan.
The PSU voltages can be checked with a digital multimeter at the ATX connector, 3.3v (orange), 5.0v (red) & 12v (yellow) if the DMM is indicating values of MORE than 5% variation your PSU is the likely villain (best to rule it out first).
Are you getting a BSOD (Blue Screen Of Death) or error messages when you PC randomly shuts down?
is the fan running.... check how hot it is on the bottom.... could very likely be thermal shut down... if it gets to hot it shuts down before there is any damage.... see if you can remove the shield around the fan and clean out the dust and dirt and in my case cat hair. if you can't figure out how to get the cover off let me know... i should be able to find the service manual for you