HTC touch cruise technical problem

Hi there,
Can anyone advise me on how to fix the following problem. My 1 year old HTC touch cruise p1450 was working fine until this morning when it starts going "crazy" - when it does not come on when I switch it on. And after I used the pen tip to do a soft reset , it will only start until HTC logo comes on then it will go off again and restart on its own spontaneously and the whole cycle repeats itself. Do anyone know what is happening?