Offer to help him out if he brings his PC to your house

Definitely works.

They figure its easier for YOU to come over to their place than it is for them to:

1. unplug everything
2. bring it to your place
3. set it up
4. wait while you fix it
5. unplug everything
6. bring it back home
7. set it up

... because they don't value YOUR time as highly as they value THEIR time.

I've seen systems sit on the floor for half a year in other people's homes, inoperable, because people are too lazy to bring them over, so they use this as an excuse to buy a new one ...

Wait long enough, and those systems become yours for free. Great for spare parts.

-- taken from a Slashdot comment