10-22-2018 07:26 AM
I've done a lot of research on this and am still stumped. My trusty T500 started to do random shutdowns a few weeks back. Sometimes it would restart with no issue, sometimes I would need to briefly remove the CMOS battery to get it to restart. Now it will only "try" to start, showing the power on, the "Z" light and the bluetooth indicator light but no Thinkpad splash screen or POST. I can hear the disk start to spin then.... nothing. I have ordered a new CMOS battery and have tried the remedies such as removing RAM, CMOS, etc with no change. The computer was working quite will before this situation. I have seen suggestions that I have a bad poly-fuse and that would make some sense if it was resetting, in partial failure or failed.
Has anyone experienced this and what did you do to resolve?
10-22-2018 10:13 AM
I've owned a bunch of Thinkpads over the years, but never a T500
Does it have the hole in the bottom shell for the "paperclip hard reset"?
If so can't hurt to try that?
If you pull the CMOS battery and hold down the power button for a long time to drain stored charge ...
(maybe leave the CMOS battery out overnight just to be sure)
Might that help?
10-22-2018 12:24 PM
I've got no more bullets at this point....................................
10-22-2018 01:26 PM
This is totally out of left field... that vintage ThinkPad has a history of mangled USB sockets. Pins end up shorted to power and that causes the later symptoms you describe: brief power up then shut down.
Don't know how it would explain your earlier issues unless slight mechanical changes caused contact to be made occasionally.
Like I said... unlikely, but easy to check. If you haven't already, get out the flashlight and the magnifying glass.
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10-22-2018 03:59 PM
I inspected the usb ports and all looks well. I was using them during the last freeze and all were working correctly. I have also replaced the CMOS battery with the exact replacement.... zip, nada, nichts... Still will not go to splash screen. It was running a little hot a few months back but I re did the thermal paste and it ran much cooler. It was non conductive paste so I'm ruling that out as a cause.
Someone has to have had this issue and fixed it???
11-09-2018 11:46 AM
OK... if you guys are still reading this thread here is a bit of a zinger. I left the T500 unplugged for over a week. This morning just for grins I tried to power it up and Bingo... started right up. What could possible be the cause for this? Is there some type of poly fuse that resets over time? Now I'm afraid to ever turn it off!
11-09-2018 04:57 PM
Jezzzzzzzzzzzzzzzzzzzzzz that's weird as hell.
I've got nut'n...
let us know if you turn it off again ;-)
11-14-2018 11:06 AM
There is no fuse that resets over time. Look in the event log and see if a hardware device is throwing errors. If it is hanging at startup, I first would check disk and memory. I like memtest86+ (free). I think on that model, you can hit F11 at startup to get to diagnostics for the disk and other things. I like CrystalDiskInfo (freeware) to check general drive health,