When I on my Acer laptop I saw that it was showing operating system not found.i off and on my laptop,I checked the bios setting to see if there was any problem.what I saw was that my hard drive was showing none.why it was showing hard drive none it was that I tried to install software unfortunately Nepa took the light after some hours there was light,I on my laptop that was when I saw operating system not found.what should I do?

My question on my hp Compaq nc6120 is that whenever I plug a flash drive on my usb port.my laptop got freezed it had 4 usb port,I had tried using the flash drive on each of the ports as I had said earlier my laptop freeze and the flash drive is working I had tried the flash drive on a different laptop and it worked.my operating system is Ubuntu it was installed on my hard disk,I think may be the usb ports are corrupt.what do you think?

My question on my hp Compaq nc6120 is that whenever I plug a flash drive on my usb port.my laptop got freezed it had 4 USB port,I had tried using the flash drive on each of the ports a[color=#000099][/color]s I had said earlier my laptop free[b][/b]ze and the flash drive is working I had tried the flash drive on a different laptop and it worked.my operating system is Ubuntu it was installed on my hard disk,I think may be the usb ports are corrupt.what do you think?[b][/b]