4x4x switch the computor is saying to service the 4x4 switch do you think the switch is bad or could it be elec ploblem this is a grand cher 1995 all four wheel drive will it to drive it like this also my radio does not work but the cd player works nothing ligths up is the radio burnt out

The computer is not seeing the front axle engage switch close. The front axle engagement is done with a vacumm motor controlled by a vacumm switch on the Transfer case. The computer waits for the electrical engage switch to be triggered. There are several parts to the system. I've seen too many variences with this problem. It is more often part of the vacumm system not working properly. You would need to verify that the 4WD works or not. Then see if the vacumm signal changes to the motor on the front axle going from 2WD to 4WD. If the vacumm signal doesn't change go to the vacumm switch on the Transfer case.(it is way up high on the T-case, hard to get at and difficult to change) If the signal changes, the T-case switch is good and your problem lies with the front axle system. If the vacumm motor on the front axle engages and disengages then replace the electrical engage switch on the front axle.
Your Radio has issues. I presume the CD player is part of the radio. If the radio works(noise and such) but just doesn't show display it may have the backlite bulbs burnt, however that would involve dismantling the radio which takes a special talent in itself.
Let me know if this was helpful?