You need to go to bios settings and restore your computer then it will start working fine. Note - while you will restore your computer. it will uninstall all softwares from your computer. so please make sure about that.

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You need to make sure about your cable connection or replace your Monitor for a while. if it still not working then it might be problem with Graphics, Ram and motherboard. So you need to check your graphics card and clean your ram and processor fan then install it back in properly. once you will do that then you need to try to start your computer. it will start working fine.

May I know, are you able to see logo on your computer or it is totally black screen ? If it is totally black screen, then it might be problem with power supply, RAM. so you need to check all that . If you are getting logo only then your windows files got corrupted. so in this situation, you need to repair your windows with the good antivirus.

You need to press CTRL + ALT and aero botton on your computer then it will make your screen default.

You need to go to acer official sites and then you need to click on this link http://www.acer.co.uk/ac/en/GB/content/g.... now you need to select your os type and then will get your drivers. Else you need to download driver checker on your computer and then you need to run it. once you will run it then it will detect the drivers and download the drivers for you automatically.

It seems like that your computer is infected so in this situation, you need to scan your computer with good antivirus and then you need to uninstall all infected programs. Once you will do that then you have also you need to delete all temp files from your computer and reset your browsers then they will work fine on your network.

it seems like your computer is missing some booting files or it is infected by viruses. so first of all we have to try to open "advance boot media option on your computer" . for opening an advance boot media option you need to keep tapping "F8" button while you are restarting your computer. If your computer comes on advance boot media option, you need to go on safe mode and then you need to scan your compute with the good antivirus and you need to restart your computer in normal mode. if it is restarting it then it is ok. if it is not restarting it then you need to restore your computer on back date when it was working fine.

Please make sure your power supply is working properly. if is properly connected but still you are having the same problem, you need to check your motherboard and processor fan. it might be problem from there.