Help!! On stero decks.

[Spulet]

I recently bought a new deck for my 91 Corolla, I started to hook it up today and got it all hooked up and working, I listened to a few CDs and the radio, it worked fine.
When it was working it was out of the dash (i didnt finish working on it, and I had to be at a friends house at 2, so I just left it out, it was on the passenger seat, it was working fine)

Then i tried to actually install it, all I did was unplug it from the deck, put it in the dash, then plugged it back in, I turn the car on but it doesnt turn on. I checked all the connections and wire ties, they are all good.

One thing I also did; the old radio ran off a 7.5 circuit thingie, and I left that in there, and it was working on that, but the radio said it should be on a 10, so I put in the 10 when I was putting it into the dash. Ive tried putting the 7.5 back in there, and new 7.5s, but it still wont start.

Also, when that happened my blinkers stopped working...

[touringcamry]

It sounds like you may have blown a fuse.

Is the circuit thingie a fuse like this

Look in the middle to make sure that the fuse is not blown. A blown fuse will have a broken connection instead of a solid conection in the middle like in the link above.

Where did you switch out the fuse?

[Spulet]

yeah thats the fuse, but ive already tried replacing it many times. the fusebox is under the front left speaker against the wall