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you have to open the memory cover and remove the two RAM s, after that remove a black or whit plastic film depending on your model, you will loacte for B500 marqued ( XXX ) or J1 you have at least short the two point with a flat screwdriver and put the upper memory and power on the laptop will holding the screew driver till you see the toshiba screen, if it doen't work just try again. it works 100%
if the fan is not running continuously then its the fan ans board problem.because the board is getting hot and fan is not running so the board is getting overheated and the machine is nor working.and if the power light is ON and fan is running but only the screen is black/blank then its the problem of inverterboard.the cost of new board is $25 get it replaced fromn near by laptop repair center.