I've got an HP dv6t that's about 4 years old runs Win7 x64 All stock except an SSD installed a few months back.
Lately while in use it will shut down without warning. The screen will go black and the laptop will take a few seconds to wind down before the shutdown. This shutdown period leads me to believe it is not a power supply issue.
Occasionally instead of a full shutdown it appears to just be in sleep mode.
Internal temp was reaching up to 80C, however this issue still happens during boot after several hours rest (safe to assume room temp).
I've run a few virus checks that have all come back clean, and just to be sure it wasn't the SSD I put the old HDD back and it still happened.
That's pretty much everything I've tried, was hoping for an expert opinion. Ask questions as needed, I appreciate any and all help.