Resposta para "PSU providing enough voltage?"Well based on your issue I don't think it is the power since LED 1 and 2 seem to be working fine. LED 3 also seems to be functioning as usual, but if it goes off could be an indication of bad graphics card. What you could do is try to connect it to an external monitor. I believe if LED 4 is off it is an indicator for a bad inverter or screen (Should be an easy fix). I wasn't sure if you were saying the monitor was coming on an staying on or going off after trying to boot. Have you tried to get into recovery mode? It seems as if the system powers on and gets stuck looping trying to boot it would be either a hardware or software issue and if you can run an AHT or get to the recovery menu you might be able to identify what is happening.
Resposta para "Gateway Laptop NV50A black screen no key functions?"I guess the first question would be.... Is it plugged in? Next, I would check the power connection inside and outside to make sure the device is actually getting power. Gateways and Compaqs are known for their power issues. If the power adapter and battery are connected you should see a light indicating it is on or off and if it is the battery it will be flashing amber indicating the battery is bad. After you answer these question we can continue to troubleshoot.
Resposta para "Why my lockscreen orientation is not changing? Plz Help"The default is portrait mode. Without a 3rd party app you won't be able to do it in Landscape without rooting the device. V/R, Brett