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So reformat a computer that can't access the hard drive, interesting trick. I believe the OP said the machine hangs in limbo with Power Lights on, I assumed the Lights are on, but no one is home, sort of like some of these solutions. Why am I not paid millions of dollars for being the smartest man alive?
I also had this problem. I turned it off and it would not turn on. I found the solution. First, extend the laptop screen as far back as it will go. Don't just stop the screen at a ninety degree angle. My laptop screen pulls back to about 135 degrees. Now press the power button. It should start up.
Why do I think this works? Well...I used to own an older model thinkpad that had a short "male" connector on the screen, that when the screen was folded down would enter into a "female" connector on the base of the unit and trigger sleep mode on the unit. This is how the system could automatically hibernate when the screen was closed. The little male connector broke off, and I couldn't get the system to wake up, because the connection to tell the laptop that I had the screen up or down no longer worked. I couldn't even power it up. I had to take an ink pen and push the connector through the female end to indicate to the motherboard that I'd opened the screen before it would even turn on.
It appears that the same type of mechanism is built into the long BAR under the screen of the NV52 and somehow it can't determine when the screen is open or closed. If it detects that the screen has not been opened, it won't power up. This safeguard prevents the laptop from being turned on mistakenly while closed up in your laptop bag. Extending the screen back resets the mechanism and it should turn on. Sorry for the long explanation...
The 4 blinks are telling you that there is a fault. The same as Computer Bios Beeps.
I,d suggest removing the RAM/Memory, and replacing it. Press and hold the power button for more than 4 seconds, to ensure it isn,t in standby mode. failing this remove the cpu and re-seat it as it may be slightly out of position, or out of it,s socket. finally have a look at the back or underside to see if there is a reset switch/hole.
Does the power brick have an LED on it? Is it on. Even if it is it may not be putting out voltage. If the cord gets bent alot it can break inside so it looks normal. If you or some you know has a MultiMeter , have them check the voltage.If you know someone with the same laptop, try theirs. If it works get a new one.
Hi do one thing remove the battery from the notebook and unplug the power cable press and hold the power button on the laptop for 10 to 15 seconds. connect the battery and power , turn on the notebook, it should work Good luck :-)