hi guys....i have a targa tg-4900usm mp3 frontloader and the anoying thing is that it goes on for a while then it switches off. only the power light is on. i tried to switch it back on but with no luck

i removed the power plug and reconnect it but still nothing. if i unplug it completely and leave it for a while and reconnect it, then it works for a while. changed fuses and with the same result...
I NEED HELP PLEASE
