Are you having problems with your HP OfficeJet Pro 8740 All-in-One Printer? Please see if any of these troubleshooting tips below will help in troubleshooting and repairing your device.
– Gaffer Tape
– Mailing Label
– Permanent Marker
– Surge Protector
– Dust Rag
– Extended Power Cord
Power Button is Illuminated
If the power button is illuminated and pressing or holding it in does not power it off, you will need to disconnect the power cable that is located in the rear of the device (left looking from the front, right looking from the back) or from the wall outlet. Once the power cord is disconnected, keep it that way for at least thirty (30) seconds. If you have to do other tasks (such as answering the phones, door, etc.) use the gaffer tape that i mentioned above and secure it to the wall or surface that the device is laying on so that it will not fall down and into a crevice that will be difficult for you to get to. After thirty (30) seconds has elapsed, firmly reconnect the power cord and power up the device.
Power Button is Not Illuminated
A power button that will not illuminate means the device is not getting power. If this is the first time the device is being turned on, check once again and make sure that the power cord is pushed in firmly at both ends. If it will still will not power on, try switching to a different outlet as these go bad at times. If you find the outlet to be bad, cover it up with gaffer tape so that you know to avoid and look into repairing/replacing it soon as the outlets often die in pairs.
Screen is Illuminated
If the Liquid Crystal Display (LCD) screen appears to be on and is missing the icons to control the functions of the device, powering it off for a few seconds will help. If the power button is not responsive as I mentioned above, disconnecting the power cable for thirty (30) seconds will help.
Screen is Not Illuminated
If both the power button and LCD screen remains off, please check and make sure that all the cables are connected properly. When shifting the device, the cord at times become loose from the back. If that is the case and happens frequently, an extended power cable will help.
Sending a Transmission
After powering up the device, it may take up to three (3) minutes for the device to get a dial tone so that it can send and receive faxes so be patient. If after three minutes you can not send faxes, please make sure that you have placed the RJ11 connectors on your telephone cord into their proper jacks in the rear of the device. In a rush, I have plugged into the wrong jack by feeling with my hands.
Receiving a Transmission
Call from a phone to see if the line rings and also to see if the device answers. If the line rings forever, check in the settings to see if it is set for auto answer. On a dedicated fax line, this will not be a problem to set as it will not pick up voice calls.