Hi Bethsalem,sorry to hear that,just tried it on my Toshiba 17" laptop,works on that too.I know I said press the keys together,should have said press FN (hold down) then press ALT (hold down) then press the right or left arrow key.It could also be that the rotate feature is not enabled in your graphics settings, (the folowing works with an Intel graphics media accelerator fitted),right click anywhere on the desktop,left click on graphics properties option.The Intel box should open,left click display settings tab,check the enable rotation box is ticked,left click apply,close the box.Try the fn alt & arrow key again,if still no good contact Acer support for advice.Regards Paul.