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Turn on a working computer with its keyboard plugged in and test if the keyboard is working properly.
If it is, shut down that computer, unplug the keyboard and plug it into the system that is suffering from the missing "NTOSKRNL.EXE" file.
Turn on the system to see if the replaced keyboard resolves the problem.
Press the "F8" key right after the system initializes the boot sequence and before the Windows logo shows up to bring up a menu of boot options.
Choose the "Last Known Good Configuration" option with the arrow keys and press the "Enter" key.
Insert your Microsoft Windows installation disc.
Restart the computer and press the "R" key on your keyboard once you reach the "Microsoft Setup" menu.
Choose the operating system that you wish to repair, type in your admin password when prompted and press the "Enter" key.
Type "bootcfg /rebuild" and press the "Enter" key to rebuild the Windows "boot.ini" file, which may also resolve the issue.
Type "chkdsk /r" and press the "Enter" key to scan the entire hard disk for errors.
Type "exit" and press the "Enter" key to exit the "Recovery Console."
Restart your computer and see if Windows boots properly.
Remove the battery and open the case. Look inside the computer with a flashlight to see if any of the capacitors are busted or leaking from corrosion. The capacitors look like little battery towers, but they are not as tall as the AA or AAA batteries.
If the capacitors are bad, your computer goes bunkers.
I would try shutting down the computer in the normal way, and turning off the monitor. Boot up and turn the monitor back on. If it still doesn't work, then I would check the cables and power plugs and wall plugs. Check the mouse and keyboard cable and any other cables plugged into the computer. The next step requires a seperate monitor or laptop. Try unplugging the monitor and pluging in another monitor. Most laptops have a common VGA adaptor jack or even an Svideo jack. If the other monitor does not work, Then take to a qualified technician for repair. It could be your power supply in the computer or video controller.
I hope this was useful and please comment if this was helpful to you.
if you want to boot from cd/dvd start your pc and when the first screen comes up press delete on keyboard a blue screen will come up select advanced BIOS features then you will see the list of the order in which the pc boots highlight the cd/dvd rom drive and hit enter you will see a page where it says to set it as first or second or third boot move the dot on the right of the one that is default tby using plus on keyboard numbers on right of keyboard untill it is at first boot then hit the enter or return key on keyboard then hit the f10 key and type the letter (y) without brackets and hit enter then your pc will restart and it should boot from cd/dvd then put in the disc you want to boot from and restart the pc be very carefull doing this if you like you can go toyoutube.com and there should be videos there on how to do this
check if your booting device is working fine...
and see the booting device in the BIOS..
if it is not found there, try connecting the same in other PC as a slave..if there also it does not work, the device might have gone