Why won't my Nexus interact with my desktop?

A

AC Question

Nexus won't interact with desktop

After some trial and error I was able to get the Nexus 10 tablet to exchange things with my desktop computer via wifi.

Recently the power supply in the desktop failed and I had to have it replaced.

After that the Nexus 10 will not be able to find the server and asks that it be re-established. I can do that, but then it will only work one way, from desktop to tablet and then it immediately forgets again.

At the same time the Nexus has been logy, sometimes quite slow on the uptake all around.