Is there a way to identify which ink cartridge is causing the problem with the yellow flashing light?

The Canon IP2770's control panel or the Canon IJ Printer Utility often indicates which cartridge is low or empty, which can help you pinpoint the source of the problem. However, sometimes it's not specific. You can try removing and reinstalling each cartridge individually to see if the yellow light changes, which can help isolate the faulty cartridge. Sometimes a slight difference in color or ink level can also be a clue.