No power. nothing.

[spaf]

Hello,

My 2003 Boxster S has been sitting for a couple months and when I went to start it, unsurprisingly it didn't. Of course the battery was dead, however, when I put a good battery in it, it still has no power. It's not just that it doesn't start, it has no power to anything.

I've checked the cables and grounds and they seem fine.

I tried connecting a battery to the jumper in the fuse panel and it also doesn't do anything. No power at all.

Any thoughts?

Thanks