I have a Sony laptop, and it sometimes passes the bios screen, it sometimes passes the Windows login screen and after it reaches Windows 7 64bit. It works fine for like half an hour, until it would randomly freeze (nothing blinks, nothing happens, keyboard unfunctional). I have to hard reset the laptop by taking out the battery. Looking at the windows event log, it's telling me that I've had a critical Kernel-Power error causing the computer to crash.
After it crashes, and I hard reset the laptop it becomes hard to turn on again, after I press the power button, the green power indicator will turn on for a moment and nothing else will happen.
I have to wait a while, maybe 15 minutes to properly turn it on again. With the luck of it not hanging at any of the boot screens, I will see Windows again.
I've tried taking out the ram, battery and hard drive, yet it doesn't effect the power button not being able to put the machine into boot sequence.
I've ran Windows memory diagnostics on the ram and it told me it was fine.
I just want to know where the problem might lie in your experience.