since there were many problems with that particular series - i would first check [http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&dlc=en&cc=us&docname=c01300427#c01300427_dv60|this page (click)]
maybe your model is covered by the extended warranty ba hp.
to make it short - many hp models died from defective capacitors.
i had the same problem with my hp g6060eg - but since we have a 2 year warranty - the motherboard was replaced by hp.