Hi I have a Sony Vaio Vgn Ns 20e, and I recently replaced a Motherboard from a friend who has the same laptop. I installed the new motherboard and everything connected and when I boot on I get the Vaio logo and immediately after I see the black screen with blinking OS cannot be found. I tried removing the HD and booted and still the same thing. I put the HD back on and I inserted a bootable Windows 7 disc and It would not read the disc however I can hear the discs running max. I then accessed BIOS Where I tried to change the Boot Priority to HD as a first but after saving and going back to the boot Priority tab I can see the changes is again reverted back, so that means that the changes cannot be saved. I tried to USB boot but the BIOS is not recognizing the USB and it only shows External Device which if I change to enable I and save it, it just reverts back. So I read somewhere on the forums with someone with a similar issue which they solved by playing with a tiny four way switch with "on" and "off" position which apparantly started booting fine. So I am really out of options as my motherboard just won't read any bootable devices. This is a one in a million problem and I would really appreciate some help, I am dying of frustration and I have university assignments within 2 weeks.