I recently bought a used Philips Matchline Garbo LC7181 projector. I can´t get it to light up a proper bright picture, it´s green/yellowish and dark - is it the lamp?? The seller told me the lamp should last 4000 hours more but that must be: in about 4000Hours the lamp will "blow up" ?!? Am I right thinking of buying a new lamp? I found an webshop selling them, not cheap but almost ok priced. Someone that could tell me if I am doing the right thing or is there something else to test first?