A:Answer Hi Vickey, apologies for what you're experiencing. 4100e is the series, and 4155e is your particular model. The flashing blue light indicates that the printer is not connected to your WiFi network. As to why you cannot power down the printer, we'd need to ask you a couple of questions to understand the issue. We recommend that you reach out to Support.HP.com for assistance. Note: you can find your manual and other resources here: https://support.hp.com/us-en/product/hp-deskjet-4100e-all-in-one-series/2100187845/model/2100187854/manuals