LAN not detecting on MSI A75 Motherboard with AMD A8-3850 APU

Hi,

I have MSI A75 Motherboard with AMD A8-3850 APU in my Home PC.
Yesterday my PC got switched off automatically, and never restarted.

Then I went to the local repairing shop, who told me that SMPS is faulty, and repaired the SMPS in few bucks.
After...