I'm sorry to hear you're experiencing some difficulty with our refillable carts in your 7900 printer.
After reviewing your order history, I see you purchased the 7900 refillable carts and ConeColor pro inks in mid-2012.
Please clarify: are you priming the carts by using ONLY the slip-tip syringe, or the syringe with small plastic priming tip attached (as per our latest video and written instructions)? As directed by the cartridge manufacturer, we originally instructed customers to prime carts using the slip-tip syringe. This procedure works very well, and I never had any problems priming this method, but we did receive several reports from customers who damaged the gray rubber seal at the end of the exit valve, causing ink to leak from the cartridge and occasionally also causing a pressurization error that you are experiencing. Due to feedback from customers, we added the small plastic priming tip, which we feel makes priming easier, and has less chance of causing damage to the cart since it is made to fit perfectly into the cartridge exit valve.
From your explanation, it sounds like you are experiencing two different issues:
1. The cartridge recognition error you got I believe is caused by the connection between the cartridge chip and printer's chip sensor, if there is not a good connection the printer will display an error, often times with several cartridge positions at once. To resolve this, push ALL carts towards the left of the cartridge chamber as per the instructions in the current refill cartridge instructions, in the troubleshooting section.
2. The 1537 error you got is displayed when the printer detects a loss of pressure in the ink feed system. Are any of your cartridges leaking ink from anywhere, or does your printer's pressurization pump suddenly come on more often after installing the most recent position refill cartridge?
Please let me know if you have questions, and respond to my questions above so I can determine the cause and solution to your issues, to help get you back to happily printing.
Thanks and best regards~ Dana