I have had this for two weeks. My kids had switched the on switch on and left it that way and I came in in the afternoon and it wont turn on now.

Check the insert sockets.

I'd suggest cheking the switch itself as well as the leads from the plug to the power supply.

Hi , i have the same problem, did you fix the problem already ?

Doubtful you can find replacement parts it, but a clever electronics guy can bypass the switch (or put on a new one) and make it so it powers up when you plug it in.

Of course I can't be sure but most amps don't have fuses on the circuit boards anymore. They use protect circuits, they may have blown your amp and yes it could be expensive. Are there indicators on the front panel? LEDs on that shouldn't be?

You may find almost anything in this. I think the power amp is on a separate board so the connections to that might have been broken. Possibility include cracks in the circuit board. First thing is to do after visual check is to check power supply voltages to verify power switch/fuse/transformer/rectifier/capacitor/regulator health. Switches are sometimes damaged... and also wires can fall of or break.

When i turn on my 212R it turns on in drive channel. if footswith is plugged in, then it turns on in the clean channel, but after switching in drive it is impossible to switch it back in clean channel. What could be wrong? Swith position doesnt change anything and it seems like switch is OK.

Try moving the switch button with your finger... they usually are alternate action with a definite click each timeyou press. If it is just "mush", then replace the switch. If it clicks then verify power supply is good.

This is the type of repair that should be done by a qualified service person.

too much dust and dirt in the switch .blow it out or spray it with contact cleaner into the switch and let it dry out