Earlier today the head unit was working fine but now for some reason the unit won't turn on. OK- I just bought my GSX.. It gets power, shows the clock, ect.. but it won't turn on when i push the power button (volume knob in) I've checked just about all of the fuses.. Any idea what it could be? Since the car is bought second-hand, there may have been underlying problems that weren’t detected. If the fuse connected to the car stereo has blown, the circuit will be incomplete and power simply can't reach the head unit (the part of the stereo in the center console). A good sign is that it has power, so it means it’s not busted. NO POWER. These must be connected to the corresponding wires on the back of the radio, Ok, so now to locate the correct earth in the loom. Car Stereo Head Unit Malfunction. if you are concerned, run a new constant power (yellow) direct to the positive battery terminal (with an inline fuse) and run the accesories power (red) to the positive side of your cigarette lighter socket or some other location near the head unit. There are a lot of possible reasons why the car stereo won’t turn on. Basically out of the blue my stereo will not turn on or function at all, however the power button still remains illuminated with the red light that indicates it is receiving power but when I press it the stereo will not power on. The cd changer has been taken out, and it has the tape player still in. Our Pioneer stereo unit won't turn on. if its staying on once you have turned the key off, your red lead is going to a constant power source, not an accesories power source. No power. If the wires are mixed with other cables and not taped properly, then your radio will cause problems and will not work correctly. Potential Cause: The most likely cause for a car that runs fine, but the stereo won't turn on at all, is a blown fuse. The power harness of our In-dash units is all color-coded to properly identify the purpose of each wire. If you have power then the only that would cause the head unit not to come on would be the ground. This unit #Pioneer XRJ-25M Model is ZA25M...is there a fuse in this unit, or will I have to take it to a Service center for repairs. The head unit of the stereo has internal and external complications, which you have to look very carefully. Checked outlets & circuit breaker but it still won't turn on. Car stereo appears to have power but won't turn on? It has the infinity sound system, tape player with the 6 cd changer. Problem: The Stereo Has No Power and Won't Turn On. The stereo head unit is the most critical component in a car stereo. The weird thing is that the power button on it is still illuminated with a red light indicating that it is receiving power, but when I press it to turn on the stereo nothing happens. Having a bit of trouble with my car stereo, out of the blue it no longer turns on. Re: New Sony gt56uix stereo has power but won't turn on this is what I would do: Pull the plug out of the radio and with a DMM (Digital Multi Meter) set it to 20v and put the ground probe on the ground wire, then hit the yellow, make sure it has power, then turn the key to the on position and make sure the red wire is hot. You can test it by finding a ground on a piece of metal behind the radio and hooking or just holding it on it. The wire which has lost power is known as the ignition feed and the wire which has retained power is the battery or permanent positive 12v wire. Which you have power but wo n't turn on it on it the power harness of our In-dash units all... 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