Sleep problem

[biged143]

For years my T61 has always gone to sleep after awhile if unused. Now it no longer sleeps but shuts down after awhile. When I hit the power button I get a choice screen to start in safe or regular. I select regular and it does a reboot complete with fingerprint to access. This is a royal PITA as it takes awhile. No settings have been changed by me. Anyone have a clue?? Thanks in advance!!

[emeraldgirl08]

Do you have Lenovo Power Manager installed and which OS are you using?

[Neil]

Please post your seven character type number.
While we wait for that bit of info, I'm going to just throw this out there as a possibility...if your T61 has nvidia graphics, this may well be yet another manifestation of the infamous defective GPU chip.