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my 1tb portable harddisk disconnecting periodically in my pc but not in other pc ,is it any psu issue?

my 1tb portable harddisk disconnecting periodically in my pc but not in other pc ,is it any psu issue?
using intel 31pr mother board 4 gb ddr2 ram intel dualcore processer ,radeon hd 6670 2gb graphic card
my graphic card also not orking it's fan is spinning but no video out put
my psu is 450w but it is 4 yr used
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More about 1tb portable harddisk disconnecting periodically psu issue
  1. Best answer
    It could be PSU, or GPU or MB. First try on-board graphics(VGA) by removing the GPU from the system, see if you can get display. If you get the display, then it may be the GPU is faulty. If you don't get the display then it could be PSU or MB is faulty.

    Second try another PSU to test.

    Third take out all the RAM sticks and start the PC, if it gives beeping sound then the MB is ok, if not the MB is dead.

    Fourth try one RAM at a time, so you can isolate bad RAM if any.
  2. Please specify model no. of every component starting with the PSU
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