Unplug the system, remove the base cover and disconnect the main battery from the system board. Then reconnect the battery and try powering up again.  
Hello, My G15 5511 laptop does not turn on. I sent it to Dell and they replaced my SSD and part of the adapter. However, it worked for one day and got the same problem again. It's obvious that it's not a matter of hardware damage more than a driver conflict. The problem happens when I install Linux and close the lid while the system is running. When I open the lid I get a black screen with a message saying "can’t change power state from D3cold to D0".When I searched that, I found in the below link that the system is powering the GPU off before the driver has a chance to load and initialize it properly: [URL] So, it could be a bug in NVIDIA or Linux, but the problem now is that I can't power up the laptop to fix this issue. How can I drain the battery to reset everything and turn it back on? Any idea is appreciated. Thanks
G15 5511, does not turn on