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Check to see if you have the machine switched out to a stand alone monitor. This is a feature on many lap tops that lets you re-direct the signal out to a larger monitor, or if your monitor fails you can display the computer info on another screen. This feature is engaged by holding down the Fn key and tapping teither the F4, or F6 key on many lap tops. This feature can be toggled by both displaying at the same time or switched to the stand alone or the Lap top.
The other cause is that the machine has malfunctioned usually because of the CPU failure and there is nothing to boot the machine up.
The computer cant find a bootable device. Either your boot sector on your Hard drive is gone/damaged (most likely a virus) or the Hard drive failed. Start with booting with your windows disk and try to do a repair installation.
Please try the following DIY
1.Please go to bios by tapping either F2 or specific key for your machine and check the boot priority.set the first priority for the odd and second for hdd.
2.if then also it is not booting issue might be with the HDD but once check with the reinstallation of OS.
its bugged or so ...ir its missing files that were deleted by the anti-virus... so ...format and reinstall ....be sure that ya format at least the C partition ....cause if ya have a recovery cd ..it will go under the last installation and the problem will reappear