Printers (Cubbington CV32)

I have three printers, all of which were working until recently but I can't get them to work any more. Ideal for DIY with more knowledge than me, or for parts. Two HP OfficeJet Pro K550 machines (and some black and coloured inks) and one Samsung ML 1610 mono laser printer (with black cartridge). They will go to the tip for recycling if no-one is interested.