LCD projector turns it's self off?

SHARP LCD projector model XV-710P. It's an old make but appears in imaculate condition. If I hit mains power the lights for stand by come on, if I then turn it on the lights for power and lamp light up green signifying the bulb is fine, the fan starts up for a second then the whole thing shuts down, dead. If I wait five mins and try again the same happens?