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.
Answer
Remember you need to run the memory tester for at least 24h to be reasonably certain that memories are OK. 3 days is recommended, and even then you can't been 100% sure.
If that does not help, another source of strange crashes is power delivery circuitry which feeds power from battery to the CPU and other components. If it's about to fail, the voltages can sag every now and then causing OS to crash. In case of laptops there's really not much you can do to that except possibly swap the whole motherboard.
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