My computer hanging problem

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Hello,

I just fixed a new power pack after not using my system for over month now but the system hanged at the white screen where the command press F2 to enter setup or F12 to enter network so I don't know what to do. someone please help me. even my keyboard hanges too.

Any idea?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References ccm.net/forum/affich-22377-my-computer-hanging-problem

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