Computer Shuts Down By itself, it just indicate that something is wrong or something is going wrong internally and it wants to make sure that it isn't going to suffer any serious damage. it could also be a memory issues and might need replacement.
Test your PSU or replace it if your power supply units fan
is not working your PSU is faulty One bad lead can cause a computer to continue on a cycle or
to shutdown or fail to detect/ boot up a computer hard drive Test all leads that attach to your hard drive including
electrical extensions,IDE,SATA the leads from your
"((motherboard to your hard drive))" make sure they have a secure connection and
are not faulty or just replace them they could be faulty
make sure all leads that
are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections
and are not faulty even the electrical extensions or just replace them they could
be faulty a computer
needs its connections to continue its cycle and have an end so any faulty leads
will end up with a computer error hope this helps
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