HP-035 High temp warning Need fix???

I have an HP-035 HD Projector bought from ebay 12 months ago. It now powers on, come up with the error - high temp warning sys will shut down in 10 seconds then powers off with a high pitched squeal. All 3 fans work fine, the inside is clean, the filters are not clogged and the bulb is brand new and works when switched on before powering off. Any Ideas. I really dont want to throw this machine as its been ok till now.