Laserjet 2600n prints color but no black or grays

The LaserJet 2600N has a built-in print server and can be connected to the local network (normal ethernet cable) directly. While printer sharing via Windows should work, I found it much more convenient to access it without the need of a hosting computer - you do not need to switch on the desktop PC for printing from the Laptop, for example, its also printing faster.

my hp color laserjet 2600n black toner always show message flshing what is the problem ?

Check out this link-

http://www.reeves-hall.net/tech-gadg...laserjet-2605/

There is an override sequence and it works well. Press the select button (checkmark) to indicate Main menu. Press right-arrow (RA) to select System Setup. Press Select , then RA to Print Quality, Hit select. RA to Replace supplies and hit Select. Now, RA to Override Out and Select. Confirm with Select again. Your 2600n will now run even with an empty toner cartridge.

Go to the "properties" and/or "nose" around for a screen that will give you the option to print in gray and/or black. It's there. Sometimes you have to go to the "advanced" functions.

an allignment need to perform on printer with proper placement.

the problem is cyan and yellow toner are low, u will change the cyan and yellow it will be cleared otherwise the will be empty u can't print any thing suppose one will empty other cartridge will not work

The black thing on the cover is covered with several colors and cannot be wiped off will this or can this be replaced

Have you tried prinitng this in MONO on your 2840 printer.
Does Wordart from Word or other office programs cause this?
If it is the office suite, then look at downloading some service packs from Microsoft.
If it's just your 2840 doing it, then look at downloading a different driver.
For some printers there are different types of PCL drivers, like PCL5 or PCL6, these do behave differently per printer, so swapping the driver might not be a bad idea.
Also check if you are using a PS or Postscript driver, but again, try the PCL alternative for your printer.

I would install the different driver under another name, for testing, then if it works just delete the bad one.

Just install 2600n manually and define as USB Virtual printer port!!!