HP LaserJet 2100

How to Identify and Fix Common Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced technical support :

The Attention light blinks. The Attention light blinks when the printer is in an error state due to missing toner cartridge, the top cover is not properly closed, or the paper is not loaded correctly or is jammed.
It may be caused by a printhead latch not being securely fastened. See Replace printheadsReplace printheads. It may be caused by a cable that has become loose inside the printer. If none of the other remedies works, call HP for assistance.
HP 2100 – To perform a cold reset, turn the printer power off, then press and hold the JOB CANCEL button. Turn the printer power back on and after all the LEDs come on release the JOB CANCEL button. A cold reset changes most system parameters in NVRAM to the factory defaults.
🛑 That error indicates that the print-cartridge door is open or other errors exist. Did anything happen prior to the flashing light? ( paper jam, changed a toner) ✔️Check for a paper jam. Here is a document for the locations to look for one: Attention Light Blinks during a Paper Jam.
Fast blinking power lights indicate that there might be an error with the printer. The flashing resume light is the indicator that the paper jam or an empty paper tray. Due to the broken parts of the printer or any internal error, the printer light starts blinking.
Ink may have run out (The lamp on the ink tank flashes). If printing is in progress, you are recommended to stop printing, replace the ink tank, and then print again.
The yellow triangle on the printer is the alarm lamp of the printer; if it is lit, it indicates that there is an item that needs to be addressed on the printer.
Seeing a yellow triangle with an exclamation mark usually indicates that a hardware device needs to be updated. If you are seeing the mark in Device Manager, we recommend checking the device status of the printer driver.
From the User Manual for your laptop, the light on the power button has the following descriptions. On: The computer is on. Blinking: The computer is in the Sleep state. Off: The computer is off.
The orange exclamation point usually indicates one of the following issues have occurred: Insufficient power. There is a paper jam in the printer. The top cover is open. No paper was loaded in tray or the tray was not loaded properly..

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

HP 2200 – blinking attention light and tray 2
ANSWER : Nice day. (QUALITY IS OUR CULTURE)

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HP LaserJet 2100

All panel lights blinking, printer doesnt respond
ANSWER : This is very easy process, you must change a new one

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HP LaserJet 2100

HP laser jet 3015 "Upgrade Error Call HP Support"
ANSWER : rgtr

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HP LaserJet 2100

HP 2200DN stopped with all 3 lights on
ANSWER : You need to press both buttons when you get the lights on. This will give you a secondary light code that tells you what is causing the failure.

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HP LaserJet 2100

HP 26 vs HP 29 cartridge compatibility
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HP LaserJet 2100

HP PSC 2410 clicking noise problem
ANSWER : I have the same issue… I’ve tried everything above… I don’t believe it’s dust as this happens on and off occasionally… I think I may need to make a youtube video of me “fixing” this printer! I’m really frustrated with this thing!! If it doesn’t work soon, I’m gonna by the solution in the form of a hammer!

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HP LaserJet 2100

HP 4101MFP Hard Drive Question
ANSWER : To initialize: turn off – Press start and hold down while turning on, release after all three light light, you should see initialize disk hit check, and allow to boot.

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HP LaserJet 2100

HP 4250n – blurry text
ANSWER : What is the fuser? And how can it be changed?

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HP LaserJet 2100