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Re: shut off after 5 secs
One of a few things, if the cmos barttery is totally flat then sometimes because the bios memory has failed it can cause a shutdown, but then normally automatically reeboots in a cycle.
The other is that the processor is the brains that takes over after the cmos post check, so the CPU may be faulty, or simply that the motherboard is not supplying enough power to run the processor, either due to the motherboard being faulty, or a faulty power supply unit, which powers the motherboard, so unfortunately it is a process of illimination.
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Remove the battery and adapter. Press power button for 30 sec. Then connect the adapter. Press power button. When pc started, go to
control panel---->power options--->change plan setting--->
Turn off the display-never
Put the computer to sleep-never
control panel---->power options--->change plan setting--->advanced power setting
-set hard disk "turn off hard disk after" to never
-set Sleep "Sleep after" to never
-set hybrid sleep setting to off
-set hibernate after setting to never
Try draining the power of the computer first. completely shut it down by pressing poweer button for like 5-7 sec. then unplug power supply from the outlet. then press and hold power button for another 15-20 sec. After that, plug back in the power cord, and turn computer on normally.