Hi Boots. Putting the graphics card in before changing the monitor or whatever could not have done any harm. Geneerally it is not possible to plug the hard drive (IDE) leads in the wrong way round, but check that the coloured stripe is next to the pin 1 mark on the board. It is often quite easy to put the floppy drive cable the wrong way round into the floppy drive, if you do this usually the drive lighht will be on all the time. Fortunately no harm is done, you just need to put it back the right way round. Try booting the computer with just the floppy drive connected and no hard drive or cd drives connected. Check that the BIOS is set for the first boot device to be the floppy and switch on with the boot disk in.