My name is Rob and I'm a printer hoarder! Here is the printer inventory at our house: Using: Canon MP 750 - All in one - Just started throwing the dreaded "wrong cartridge" error. Brother HL2170W Laser - Works great and is Ethernet connected so my wife can print when my PC isn't on. Not Using: Canon i860 - In storage since getting the MP 750. I used the print head from this one into the MP 750 for the past 3 years and left the new MP750 head in the original packaging. Canon i560 Refurbished - Three (yes three) in box refurbished printers (from Fry's when they had them on sale for $29 with brand new Canon carts). HP LasertJet 4 Plus - on its way out So, here's the current situation: As stated above my MP750 just started with the "wrong cartridge" error. I've tried all the suggested fixes to no avail. Seems most people are unsuccessful at fixing this problem without a new print head. I'd really like to do the following: Ditch both "using" printers Get a laser All In One (at Costco either the Brother MFC-7440N or the Canon ImageCLASS MF4350d) Use the i560's for color printing (I like the thought of having instant replacement parts as backups). I've got the extra brand new print head, but do I put it into the i860 or into the MP750, but that leaves me with a good printer or all in one with no printhead. Do I keep the working one or sell it? I guess if I'm selling I'd be best off putting the head into the MP750? What do you guys think?