Radio Dead after hoildays.

Hey.
I went on hoildays for about 4-5 days, left my car at home.
Came back and tried to start it but it was dead. (not even the cluster lights & alarm worked)
So i jumpstarted it and the car started. Only problem is that the radio doesn't turn on.

Have i fried the electrics?

have you checked your fuses?

could need a security code or something...

i don't think its the fuse cause the light on the lcd flashes for a second after i turn the car on.

and i tried the security code already.