- PC seemingly turns off completely. After taking off the cover it turns out the fans continue to run after this happens.
- After this happens, the power button light turns and stays orange (it is white while running and dark while powered down). I can't restart the machine without unplugging it and plugging it back in.
- No warning messages of any kind. When I have had overheated PCs in the past, I have usually seen a heat-related warning message.
- Happened so far when browsing the internet, while idling, while booting, while running Windows Startup Repair.
- Fans seems to work fine.
- I ran a thermal test program on the box, and the highest readings I saw were GPU (68C) and "temp3" (62C). I have no idea what "temp3" represents.
- No changes have been made to the PC recently (software or hardware), outside of a minor move (really just sliding it about 3 feet a few days ago).
Windows Startup repair did run successfully, and said it couldn't fix the problem. The last entry in the log said "Root cause found: unspecified changes to system configuration might have caused the problem". The error codes it listed on the summary screen included 6.1.7600.16385 and 661. The final entry on the summary screen said "NoRootCause". I'm not sure how much faith to put in this tool.
Edit: I should note that the startup repair tool seems to have come up because this problem occured a few times during startup. The computer does start up successfully and sometimes stays running for a while before it randomly shuts down.
I realize this may be hard to troubleshoot via a forum. I am looking for help in steps I can take to diagnose the problem (programs I can run, etc.). I am very computer literate, to the point of having built my own PCs in the past (but I am by no means an expert).
The PC is a Dell XPS 7100. It is not under warranty anymore. It's a little under 2 years old.
Thanks for any insight.
Additional notes from my replies (see posts below for context):
My keyboard is the Dell keyboard model SK-8115. I have been using it for years, even before I got this PC IIRC. I believe I have had it for 4 years or so.
I use a KVM to switch my keyboard, mouse and monitor from my laptop to my desktop. I just let my desktop run for a while with the KVM switched OFF of it and it still failed--should that rule out the keyboard being the problem? I also have spare keyboards I could use to test with.
The event viewer does not show anything.
Additional info: I used a program (Fan Speed?) to log the temperatures in my system. The log did not show any spikes in temperature before the last few failures, although I'm not 100% sure I am logging the right values.
I have also tried jiggling wires inside the PC and moving the PC around a bit while it is running to see if that would induce a failure (someone suggested this to someone having a similar problem). It didn't induce a failure.
A few more notes to add. I changed out the power cord, and plugged the cord into the wall directly instead of the power strip it was currently plugged into. This did not solve the problem.
I am also seeing a new symptom. Now when it shuts down, instead of simply turning off (with the fans still running), it seems that it is trying to restart. The fans turn on and off, and the computer starts making the noises it would normally make when trying to boot/post. The power light goes from orange to white and back to orange. It does this repeatedly until I pull the plug. It was not doing this previously.
Edited by Phil Sandler, 25 March 2012 - 01:15 PM.