THEY JUST OPEN LAPTOP AND HEAT UP GPU ON MOTHERBOARD.. The same problem i found in my laptop dell n5010. 8 beeps has many possibilities, check following 1) cable of display if found loose , disconnected then tight or connect in socket 2) if cable is connected well, try external monitor, if it works on external monitor, display is dead, replace it 3) if external monitor not working, and system is running but no display then GPU ball connection with motherboard are melt and disconnected. it can be fixed by various reflow methods 4) if not working above there may be motherboard failure, ask expert and replace if need. sometimes heat sink pipe (heat pipe ) stop working and so heat can not pe transfer from motherboard to atmosphere, so overheating and motherboard failure such as 8 beeps, disconnected GPU is resulted, heat pipe used by dell and other company have very long life so , 90 to 95% cases have not problem of heat sink pipe. I REPAIRED MY DELL N5010 WITH SAME PROBLEM....ITS GPU IS OVERHEATED AND...