Hi Roberto,
Well many thing could be happening here for example,the DMD board could not be working properly,please also listen carefully for any strange noises,like high pitch whirling sounds,that could mean that your color wheel is not working properly,the lamp will only last you from 6000 to 8000 lamp hours if you have a Phillips lamp and if you have a generic lamp that will last you from 3500 to 4500 lamp hours but i doubt that, this is your problem you can go to www.fixyourdlp.com for further trouble shooting
Regards
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