Why is my pc not turning on
it turns on and shows the blue screen loading with the attempt to go where i usually put my password but keeps on saying diagnosing
If you have Win 10 installed (you haven't said what OS is installed) try entering the WRE (Windows Recovery Environment) menu.
To do this, turn on the laptop and when it boots into Windows, force stop the laptop by holding the Power button until it shuts down.
Do this 3 times, i.e. Power on > boot > force stop > power on > boot > force stop etc.
On the 3rd attempt it should boot into the WRE.
Select troubleshooting > advanced > Startup repair and follow the prompts.
If this doesn't work use the same procedure as before to get into WRE and select either the system restore point option or the system image option (if you have them that is)
DO NOT select the Reset this PC option as this will erase all your data and reinstall Windows.
If you can't get into WRE for whatever reason, you can create a Win 10 recovery USB from any known working Win 10 PC. You'll need an 8GB USB flashdrive and about 60 minutes of time to create it. Go to Control Panel > Recovery and find the create USB recovery drive link - You should make one yourself when your laptop is working and keep it safe in case of future problems.
When you have the Recovery USB drive, insert it into your laptop and then when you start the laptop press F9 to select the USB drive as the first boot option and then restart the laptop . If it doesn't boot from the USB go into BIOS and enable Legacy USB function in the settings.