When i turn it on it shows no operating system not found

you need a windows disk and reinstall your operating system

Change the video-card inside your computer, and install the correct drivers for the new video-card.

Try physically reconnecting the hard drive, and make sure BIOS sees the drive.

there is problem with your hard disk. your hard disk wire may be loose. try to remove and refix all sata wires of your hard disk. "operating system not found" message may be coming because you may have not installed any os (windows, linux or mac) in your notebook. try to install operating to system to fix this. there may also be proble with your hard disk, your hard disk may be dead. if your notebook is showing message "operating system not found" without any reason then you may have put your notebook in high magnetic field area. due to high magnetic field, sometimes hard disk's are formatted automatically.

Hard drive failed, replace it

Hard drive maby dead, or formated...

The mac operational system is designed for apple computers only, It will only recognize the drivers in the apple product line. The pc computers have a different configuration and will not except this software.

Hello,

its showing operating system not found, because the system cannot detect your hard disk.

Open your system, remove and fix back the hard disk, then try again.

Take care.

Try tapping F12 as soon as you turn the system on. Make sure that the CD is inside the CD drive before you press F12. Or if F12 is not the right key to launch you boot options, try to insert the disk, if you see "press a key to continue", then press a key right away. Try another XP CD, if you have one.

On my ThinkPad Notebook Windows 7, I have got "operating system not found" error, to fix problem, Windows Boot Genius helped me finally!