My ink cartridge is not being recognized. I tried with two new cartridges and it's saying they are not compatible. (CANON MP530)
Are these actual Canon cartridges, or are they third-party cartridges? Not that all third-party cartridges are bad, but it is the non-name brands that often cause these kinds of problems. If you are using a different kind of cartridge, buy a Canon cartridge and see if that helps. If you are refilling the cartridges, some of the newer models of Canon have a microchip in the cartridge that can't be reset. Basically, when it has run out, the microchip will keep it from being used after it has been refilled.
Troubleshooting Printer Errors
You probably tried it already, but the first thing you should do is to unplug the printer from the wall, wait about half a minute and then plug it back in again. After you've done that, if there is a light flashing on the top of the printer, find the reset button and hold it down. This button usually has a red triangle inside of a red circle. It may take several seconds for the machine to power down so that the light goes off. Turn it back on again and see if the printer cartridge is recognized.
I'm not sure about this particular model, but some printers require that you change all of the cartridges at the same time, rather than just the cartridge that has run out. If you change only the black, the color cartridges will not be recognized by the machine.
Reinstall Printer Drivers
You can find the printer drivers by going to Control Panel and then to Add/Remove Programs. Find the printer driver and uninstall it. Power down the computer to reboot it and clear out the Print Spooler. Often, when you restart the computer and the printer it will be automatically detected and the drivers will be downloaded automatically. If not, you can go to the Canon website here and look in their download library for the right driver.
Hopefully you can use these tips to get up and printing soon. Let us know if you need any further help.