content: Welcome! I have an old HP LaserJet that could probably use this treatment if if ever bothered me enough. I thought it was neat because I like old computers and have always wondered why they turned yellow. Back in the day Acer was the only company making black components, now it seems to be the norm. I wish I would have saved some of my old super thick Computer Shopper magazines. That was the only way to find good deals before the internet.