How do I check and resolve toner cartridge issues on my HP 2600 printer if it's not printing?

Open the printer's toner access door. Carefully remove the toner cartridges and check their toner levels. If they are low or empty, replace them with new, compatible HP 2600 toner cartridges. Ensure the new cartridges are properly seated in their slots. Sometimes, a gentle shake of the toner cartridge before installation can help distribute remaining toner.