network problems

Mighty White is back ! Sony said they could find nothing wrong. Passed all their tests so brought it home expecting it not to work.

Turns out fine but now my pc can't connect. It's like you fix one thing , and something else goes bust. So irritating. 2 weeks ago pc hang and mighty was fine. Last week, mighty went for servicing and pc was fine. Now this week, pc won't connect and mighty is fine. WTFLAH

Now need someone with routing expertise to connect modem to router to pc to mighty.

I have no clue when it comes to DNS, TCP/IP , IP address whatever whatevaaaaaaaaa

I JUST WANT IT FIXED. WILL PAY GOOD MONEY.