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It sounds like the volume button may be jammed or the volume up switch may be bad. If the switch is open just enough to let some voltage through it locks up the microprocessor. Unless you have a multimeter and know how to check resistance on a switch you would be better having a professional repair person check it out.
I have a 2008 Sonata with satellite radio issues also. Everytime it rains and I have to do any traveling in it, the storage box located in the trunk floods and shorts out the receiver,LIKE OVER THE WEEKEND!!. This will be the fourth replacement and they (Dealership)still cannot fix the problem.
You have a bad power plug on the unit. The solder connection are loose. The one have is doing the same thing. The power plug pins have came lose and need to be resolder. Working on how to take the unit apart to solder the connection.
I am sure that the radio fuse was checked to see if power is actually going to the radio? The next thing to check is the multipin plug on the back of the radio. If it was removed sometimes the pins get bent when plugged back in. Make sure all pins are clean and straight. Try to disconnect wires that were changed to install the amp and put everything back to original and see if the radio works. The amp should have a direct connection to the battery with its on fuse correct? Depending on the amp if new or used may have internal problems and will have to be sent back to the manufacturer for repair. Hopefully when the wiring is put back to normal in the vehicle the radio should work, unless the amp load has damaged the output transistors to the original radio. Good luck.
there is a memmory wire on the back of the radio which is usually yellow this needs to go to a constant source of power
red wire (power) goes to accessories black to ground
you need a test light to find constant source power wire in truck and to find an accessory line wire for red this should fix problem and dont forget reset button on radio after you done the wire fix
lol i had that happen to me once i had to take out the stereo plug it bk in but turn it upside down and then eject it after i did that i never had a problem with it again but then again i only kept it for another month then got a new 1, good luck hope this helps