I have a assembled computer. My system configuration is Intel Core 2 Duo CPU, 4 GB Corsair RAM, Gigabyte motherboard and 180 GB HDD. Now I had added a usb dongle first to get some extra ports. I had connected a external usb drive which is showing up Unknown device status message. Leaving that I added 512MB GPU on my motherboard and due to that there is random shutdown on the system.
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