We've seen this a few times and it always has happened with the use of 3rd party cartridges (what a coincidence). Compass Micro (compassmicro.com) has the contacts - their part number for a Stylus Pro 7600 is GEN9501. In my opinion, it is a tricky repair to get them in without causing more damage - but if the printer isn't working, it won't work any less well after you attempt the repair, and you have the potential of fixing it without spending a ton of money.
Tony