Pioneer S9 will not turn on

My S9 will not turn on for some reason, its 14 months old and have never had any problems with this unit at all. I turned up for work pluged in the unit and was running for 1 hour then it just powered down then came back on then powered down again. Now all that happens when i turn the unit on the utility light just comes on and keeps flash. I have tired what it says in the manual but nothing is happening, can someone please help?