I have a new information:
This problem in my laptop is caused by a motherboard incompatibility with the processor. I believe a BIOS update could fix it, but a guy with the same laptop guaranteed me that other processor can fix it too.
My processor is a Intel Core 2 Duo T5750 (Merom) and some working models are T8100 and T9300 (Penryn).
I have a new information:
This problem in my laptop is caused by a motherboard incompatibility with the processor. I believe a BIOS update could fix it, but a guy with the same laptop guaranteed me that other processor can fix it too.
My processor is a Intel Core 2 Duo T5750 (Merom) and some working models are T8100 and T9300 (Penryn).