Computer question

I have a custom computer that was built for me several years ago.

It sat idle for a few years with no power going to it.

Here's my issue, about 3 weeks ago, I lost another computer to a lightning hit and the other computer in question was on the same circuit.

Now, it turns on but there's no signal.

What are the chances that it simply lost it's memory after the CMOS battery drained, and not power surge damage?

Also, I'm looking for a computer repair shop in the Monroe/Ruston area.