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Thank you so much for replying. I have Windows 7 and a kensington slimBlade media mouse and use one of those little things you plug into a usb port. Sorry not very good at all this and dont know the name for it. Its like a memory stick thingy. Dont suppose its got anything to do with it but recently my screen has been flashing slightly but last night it got worse and today its doing it so much I cant use it anymore so am now using my PC. Will have to take the laptop back to the shop tomorrow. Thank you once again.