Radio and clock wont turn on

Hi, a co-worker told me to try this place with my car problems.

I don't know why but my car radio and clock wont turn on. My cigarette liter still works if that helps at all. I have replaced the fuses and know close to nothing about cars:confused:.

This has happend to me before with this car. Took it into the shop to get something else fixed(when idle the rpm would rev up, drop and back up) and when I picked it up I asked the guy why it wasn't working and he looks at me like wtf and it was working fine after that. Until it died again.

I need some tunes!

fuse located in fusebox under hood labeled radio backup fuse typically 7.5 fuse