My Dell Inspiron 518 was working normal until last night when I successfully turned it off before going to sleep. I remember last months case when my screen was facing flickering issue; and so I had replaced the power supply unit to make sure it isn't the case. At first it didn't affected to the problem but after few days, my computer started working all of a sudden. So I don't think this is related to my problem. This was just to inform you a little history of my computer. I have tested all the components of my computer except motherboard and nothing seems unusual. So what can be the cause of the problem?
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