My Dell Inspiron N5040 was not powering on. I thought it was because of dirt inside. Therefore, I opened up the laptop, cleaned the fan, replaced the thermal paste (after cleaning off the old paste), cleaned the motherboard with IP alcohol and then put together the laptop again.\n\nWhen I inserted the power adaptor and switched on the AC power, I heard a beeping sound. It was a two-beep sound. I knew that meant no RAM. Therefore, I inserted both the RAM ( 4GB each). The laptop powered on. After some time, I shut down the laptop from the desktop. \n\nLater, when I tried to power it on again, it just wouldn't power on. This time no beep sound either. \n\nI tried reseating the two RAM sticks. I tried using just one RAM stick. None of this worked.\n\nWhat could be the problem? Does the RAM need to be replaced? Should I buy two new memory sticks of 4 GB each?