HP Color LaserJet 2840

How to Identify and Fix Common Problems ?

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Faulty power cords and connections are an uncommon but possible cause of a printer not turning on. Before suspecting a cord failure, ensure that there is power to the wall outlet and there are no conditions preventing the printer from turning on. Testing by substitution can confirm if a cord connection is the problem.
The printer is either low in toner, the density is set too low, or the Economode may be turned on. Remove the toner cartridge and shake it. This will redistribute the toner and often will temporarily solve the problem. However, this usually indicates it is time to install a new cartridge.
Turn on the printer

Connect the power cord between the printer and a grounded AC outlet. Move the power switch on the lower-right bottom of the printer into the On position, and then press and release the On/off button on the front of the printer.

The fuse protects your printer from short circuits and power overload. It is placed between the power outlet and the switch on the left side of the printer. If your machine does not start after pressing the power switch, at first you should check if the power cable is connected to a power source.
A blinking Power light might indicate a `Fatal Error,” that requires a printer reset. Follow these steps to reset the printer. Without turning off the printer, disconnect the power cord from the rear of the printer. Wait 30 seconds, and then reconnect the power cord to the rear of the printer.
Turn the printer off then back on. If the issue persists, turn the printer off, unplug the power cord and then wait at least three minutes before plugging the power cord back in and turning the printer back on. If the issue persists, ensure the product is running the latest firmware available from HP.com.
With the AC adapter unplugged, press and hold the power button for approximately 15 seconds. Reconnect the AC adapter, and then turn on the computer.
Battery Troubles:

If your HP laptop has a removable battery, remove it and reinsert it after a few seconds. Sometimes, a faulty connection can cause the power light to blink. If you can access a spare battery, try swapping it to see if the issue persists.

Printer sleep mode

Check that the printer does not have sleep mode enabled: Go to Control Panel > Devices and Printers. Right-click the printer in question, then select Printer Preferences. Look for an option to disable sleep or time-out mode.

Battery Troubles:

If your HP laptop has a removable battery, remove it and reinsert it after a few seconds. Sometimes, a faulty connection can cause the power light to blink. If you can access a spare battery, try swapping it to see if the issue persists.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

HP 2840 displays: "59.4 error – please turn off/on again" when trying to print/copy pages.
ANSWER : Fuser errors are 50.XX 59.4 is the fuser motor. http://www.fixyourownprinter.com/posts/67008

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HP Color LaserJet 2840

HP Color Laserjet 2840 spitting out blanks
ANSWER : Moe- You are the man!

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HP Color LaserJet 2840

error 59.99 turn off then turn on
ANSWER : Read this forum thread http://www.fixyourownprinter.com/posts/51164

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HP Color LaserJet 2840

HP 2840 All-in-one ,image drum counter reset
ANSWER : Hi, My HP 2840 is showing replace supplies on all but black , to print color all I have to do is send print command before the printer shows ready and it will print full color , also the windows test print works at any time ? It’s a pain but it works !

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HP Color LaserJet 2840

How to copy a card slot in HP laserjet 4250N
ANSWER : None that I know of, using a computer is likely your best option but I never attempted it.

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HP Color LaserJet 2840

What repair needs to be done for a "50 needs repair" message on an HP Laserjet IIIP?
ANSWER : I don’t know what you mean by good toner cartridges. They haven’t been built in about 10 years, so if they are new OEMs in the box, they are guaranteed to fail. The 50 error on that printer is mostly a burned out fuser lamp. This site was sold, so as you can see, there are no more kits available.

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HP Color LaserJet 2840

evenly spaced horizontal lines on hp laserjet III printout
ANSWER : The lines would be a toner cartridge problem. Which paper tray? The MF tray or the optional paper cassette?

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HP Color LaserJet 2840

HP Laserjet 4250 – RFU LOAD ERROR
ANSWER : Italiano:

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HP Color LaserJet 2840