What does a blinking "Error" light on my HP LaserJet P1005 typically indicate, and how do I begin troubleshooting?

A blinking "Error" light on the HP LaserJet P1005 usually signifies a problem preventing the printer from operating, such as a paper jam, an open cover, or a toner cartridge issue. To start troubleshooting, first check for any visible paper jams inside the printer and in the input/output trays. Ensure the top cover is fully closed and the toner cartridge is seated correctly. If these steps don't resolve it, try power cycling the printer (turn off, unplug for 30 seconds, plug back in, turn on). This often resets the printer and clears temporary errors.