HP Pavilion .. reboots when house air conditioner comes on ... any thoughts?

I am working on a friends HP Pavilion M7850 because he was having an
issue with the computer rebooting.

Well, I started noticing that whenever the house A/C comes on, the
computer reboots.

By the way, the power supply failed about 9 months ago and I replaced
it with a 200w (the original was a 180w) power supply from a small
computer shop.

Anyone heard of this before? Any thoughts on how to fix it? I was
thinking about either trying another power supply or a UPS to see if
that clears things up.

Thanks!
.

Relevant Pages