I know the same problem happened with me. it a problem with ur ram chip ..... u open ur computer and on motherboard u can find ur ram chip there are 2 clip at both end press them down. the ram chip will come out((important note: see the position of the ram chip ))then take the ram chip n there are little golden lines at the end clean them with the help of rubber a pencil rubber and put the ram back into the computer n ur done the comp. will work properly.............enjoy