Radio and Clock

[Johnnie Jellybean]

I recently changed my alternator and battery and i know i have to enter a code for the radio but i can't turn it on,

I also have the problem of the clock resetting when i open the door or turn off the key.

I have checked all the fuses and they are all ok ......Is there a fuse ( like in the older cars under the dash attched to the wires ) .

I would appeciate if someone can help me . 2004 Aveo

Thanks