So I'm trying to fix a friend's laptop (Acer 8735G-6502) that keeps restarting, but I can't figure out what the problem is.
Symptom: In Windows 7 (or Linux) the laptop suddenly shuts off with no error message then restarts. It appears that it can happen at any time (heavy load, during startup, web browsing, etc.), but might not do it when idling. Also, the DVD drive is not recognized by the bios or Windows. That may be unrelated.
Checked so far:
Power - I've tried it unplugged/plugged with the battery and without. (It doesn't turn on with no battery when not plugged in ). I've tried numerous power strips and outlets.
RAM - I've ran about 4 hours of Memtest86+ from USB with no errors.
DVD - It does the same thing with or without the DVD drive connected.
HDD - I've removed the HDD, swapped in a new one w/ fresh Windows install, and ran Linux installations from USB with the HDD and DVD (all the SATA devices) removed. It still crashes just the same.
Graphics - Discrete GeForce GT 240M. I have not tested this.
Motherboard - I've eliminated SATA ports & SO-DIMM slots as the cause so far.
CPU - Here's where it gets strange. It has, thus far, NEVER crashed in Windows Safe Mode (or Safe Mode with Networking), yet it crashes in Linux and Windows. I've ran LinX to stability test the CPU in safe mode and do not get errors.
Network - It restarts whether or not there is a connection on the Ethernet port.
Summary:
It can restart with no warning in Windows 7 and Linux on USB. It does not appear to ever restart in Windows 7 Safe Mode (even when left overnight running virus scans and defrags), seemingly ruling out an inconsistent power connection as the culprit. No hardware tested appears to be related to errors. I guess I need to try harder to crash it in Safe Mode or try a Windows XP installation?
Any ideas? So far all I've got is a dying motherboard?
I also posted this thread here: http://www.tomshardware.com/forum/75662-35-laptop-restarts-safe-mode
Sorry Mousemonkey if this is not the right section/format.
Symptom: In Windows 7 (or Linux) the laptop suddenly shuts off with no error message then restarts. It appears that it can happen at any time (heavy load, during startup, web browsing, etc.), but might not do it when idling. Also, the DVD drive is not recognized by the bios or Windows. That may be unrelated.
Checked so far:
Power - I've tried it unplugged/plugged with the battery and without. (It doesn't turn on with no battery when not plugged in ). I've tried numerous power strips and outlets.
RAM - I've ran about 4 hours of Memtest86+ from USB with no errors.
DVD - It does the same thing with or without the DVD drive connected.
HDD - I've removed the HDD, swapped in a new one w/ fresh Windows install, and ran Linux installations from USB with the HDD and DVD (all the SATA devices) removed. It still crashes just the same.
Graphics - Discrete GeForce GT 240M. I have not tested this.
Motherboard - I've eliminated SATA ports & SO-DIMM slots as the cause so far.
CPU - Here's where it gets strange. It has, thus far, NEVER crashed in Windows Safe Mode (or Safe Mode with Networking), yet it crashes in Linux and Windows. I've ran LinX to stability test the CPU in safe mode and do not get errors.
Network - It restarts whether or not there is a connection on the Ethernet port.
Summary:
It can restart with no warning in Windows 7 and Linux on USB. It does not appear to ever restart in Windows 7 Safe Mode (even when left overnight running virus scans and defrags), seemingly ruling out an inconsistent power connection as the culprit. No hardware tested appears to be related to errors. I guess I need to try harder to crash it in Safe Mode or try a Windows XP installation?
Any ideas? So far all I've got is a dying motherboard?
I also posted this thread here: http://www.tomshardware.com/forum/75662-35-laptop-restarts-safe-mode
Sorry Mousemonkey if this is not the right section/format.