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No boot It all started 8 days ago. I was browsing internet and I got a blue screen and computer went off. Now everytime I turn it on there is no display on the screen(light stays amber), all the fans are working fine, the power light on the tower remains on and the CD drives comes on startup. There are no beeps at all What I have done so far: 1. Power cycled the tower several times. 2. Redone the cabling on the motherboard. 3. Reinstalled the RAM (I have two 4 GB DDR3 sticks). 4. Replaced the motherboard battery. 5. Cleaned the tower and all the heatsinks inside the tower with air blower. More details: a) The computer is dual boot with ubuntu. b) Computer would boot up occasionally but won't load the os. For Windows 8 it shows up error about missing ntoskrnl file. For ubuntu there is no error message but just a black screen. c) Lately I discovered that the computer would boot up to the above condition in the morning or if have not tried to turn it on for a oong time. d) after 3-4 tries of step B it goes back to the original problem state. e) Today 7 decided to boot it with an ubuntu live cd to see if it works but it does not and stays on the black screen. e) The computer is around two and a half years old. I guess there 7s some problem with either motherboard or the SMPS. waiting for teh suggestion.

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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.

Posted on Feb 17, 2014

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