dear sir mydell inspiron 1525 laptop starts fan runs but the screen is blank i was told that the motherboard has 2 slots and originally fixed 1 gb each ddrm the tecnician told that 1 slot is not functioning properly he used the eraser but still this did not fix the problem at present i am using only 1 slot with 1 gb ddrm i dont know how long the computer will work kindly help me how to solve this problem as u see the new mother board cost is as good as buying a new laptop