It happens you go to turn on your computer and it won't boot, this is a common issue with a vast array of causes. To find out what issue you are suffering for will take some troubleshooting.
First think of any recent changes, hardware upgrades you have done on your machine. Incompatible hardware, something might have come unplugged inside the computer.
The computer won't power on at all, verify that your computer is plugged in to the power outlet and that the ac plug is not loose. If all cables are connected on the outside open the case and verify that all the cables are plugged in to the correct location on the board and power component. Check that the monitor is powered on and all the connections on the back of the monitor are secure.
If computer powers on and says no bootable device this will be on a black screen. This mean that the computer is not booting from the Hard Drive that it is suppose to boot from. The device boot order might have changed, enter your computers BIOS and check Boot Order. If the hard drive is not listed at all the hard drive might have failed and is no longer able to be booted from.
WIndows Freezes or Crashes During Boot this could be signs of a software or hardware issue. Try to perform Startup Repair or Recover the computer from a perviously successful boot. Another option is to use the Windows disk and reinstall a new copy of Windows if all else fails.
Windows Start & BSoD or Freezes this is another sign of software or hardware problem. First try booting the computer in Safe Mode since windows doesn't load all drivers when a computer is loaded into safe mode. If computer loads in safe mode try and uninstall recently installed software, check for driver issues. I would also suggest running a malware scanner to check for any corrupt files. Also you can check the disk in command prompt - chkdsk which will check the hard disk for any issue and attempt to fix any issues found.
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