Solution 4 - Try Hard Rebooting. Hard rebooting the laptop worked for many ASUS laptop users to solve the problem. So follow the instruction to do so: Reboot your laptop and as the ASUS logo appears, press the F9 key. And when the Windows Boot Manager screen appears hit Enter. Note: If you have not performed any of the following steps and your computer fails to power on, please refer to this article: Troubleshooting - Notebook cannot power on and shows black screen. Disconnect or replace the battery. Replace memory with a different capacity or brand. You may find your ASUS laptop won't turn on and shows a black screen. This is a problem reported by lots of ASUS users. Some people said their ASUS laptop won't turn on and the light is off while others said the ASUS laptop won't boot but the power light is on. When your ASUS laptop won't turn on but the lights are on, it can be a frustrating experience. There are several common causes for this issue, and troubleshooting steps that you can take to resolve it. Understanding these causes and steps can help you get your laptop up and running again. Let's see some common reasons for ASUS laptop not turning on: Certain hardware or software is corrupted. The power supply for ASUS laptop is insufficient. There is something wrong with the screen of ASUS laptop. Then, I will walk you through some useful methods to fix ASUS laptop won't turn on issue in the following paragraphs. You May Read If the power light is on, but your ASUS laptop still won't turn on, try the following methods to fix this error. Fix 1. Check ASUS Laptop Display Settings to Fix ASUS Won't Turn on Issue. You can check for ASUS laptop screen problems by turning the display on and off. It could be on but your brightness just could be turned down use the FN key+ brightness key (F5) to turn up the level, also you could try plugging in an external monitor to see if that works press FN key + F8 to toggle the external monitor, if it works you need to press windows key + CTRL + Shift up + B to set it to default. 812K views 4 years ago THIS VIDEO HAS BEEN UPDATED HERE: • Computer Screen Black / No Display - Troubleshoot why your Asus Laptop turns on but the screen stays black, dark, dim, Power off your computer while in a power saving mode by holding the power button down for 3-5 seconds. After the power is completely off, turn on your PC and test to see if it will boot normally. Troubleshoot the cause of the beep code if you're lucky enough to get one. CV5O.