I have a HP G70 Notebook - 32 bit operating system. This came with its usual AC adapter and every now and then my picture fades and it keeps on telling me to connect a higher rate adapter. The adapter is plugged into a surge protector extension, so is the adapter faulty or the surge protector. If I need to replace this adapter, where in England is the best place to get a good reliable one and now one of those scam ones you see on the TV?