Computer just shut down for no reason won`t boot back up

OverheatingWhen the CPU overheats then it will shut down (i.e. thermaloverload) and won't boot up again until it has cooled down. If this is theproblem is not fixed then the CPU will eventually fail.
A faulty fan causes the problem or the fan and heat sink assembly are cloggedwith dust.
Check the CPU fan to see if it spins freely, if not replace the fan.
If the fan and heat sink is clogged with dust the remove the dust and make surethe vents are clear and dust free. Use a small brush and can of compressed airto do this.

does the power indicator blink when the set shuts down? If so thats an error code let me know the number of blinks and I will assist with the reason why the set is shutting down.

you are cold booting the pc always shut down normally when you shut down just useing button it will eventually corrupt the system I have several computers and never shut them off at all unless installing new hardware if you get a keyboard with the specific button just for the sleep mode this problem will clear up but if you shut down normal it will work rite

When the CPU overheats then it will shut down (i.e. thermaloverload) and won't boot up again until it has cooled down. If this is theproblem is not fixed then the CPU will eventually fail.
A faulty fan causes the problem or the fan and heat sink assembly are cloggedwith dust.
Check the CPU fan to see if it spins freely, if not replace the fan.
If the fan and heat sink is clogged with dust the remove the dust and make surethe vents are clear and dust free. Use a can of compressed air to do this.

That shouldn't affect the laptop booting, hold down the power button for 10 seconds, it shoul boot up., if not then remove the battery and replace it. then try it again, good luck, Gym

Have you tired holding down the power button. Other wise what model is this computer? And how far into the boot cycle does it get?

Hi

When you boot the computer back up go into Safe Mode and check to see if you can roll the computer back to the point before you installed the software.

If so this should work. If it works then run a virus scan, a defrag of the hard drive and cleans the temp files.

OR

You can do a diagnostic startup and uninstall Onecare. So once that it is uninstall ed it should be smooth sailing.

Here is a link for some startup / diagnostic software you could try after booting.

I hope this helps

/Shawn