Archived from groups: comp.sys.laptops (More info?
I think you have to reseat you CPU-card.
My wifes ThinkPad 770 developed these symptoms over time.
1: Began to freeze suddenly inside Windows.
2: Later it would just boot up.
3: Later again it just passed POST.
4: Last, but not least....it wouldn't even boot. Stone dead.
Disassemble the ThinkPad 770 till you get into the CPU-card.
Take it out and put it in again. Be firm !
Assemble the ThinkPad 770 again. Power-up and voila :-)
This is an error that occurs, when the ThinkPad gets warm, when using it,
and cold again when it's not used.
Within some years, these repeated warm'n cold periods will make the CPU-card
pop out of the socket.
You need the procedure to disassemble your ThinkPad 770
Here it is. The Hardware Maintenance Manual for ThinkPad 770
Good luck and please do report back to us.
Brian Hougaard Baldersbæk