Magents prints in thin, almost non-existent threadlike lines

Brother and other printer manufacturers are preventing use of non-OEM ink to stifle competition.

that print head is clogged,
do the clean cycle shown in the manual;
new cartridge time if cleaning does not work.
all things work last week but now.
nothing new here and for sure pesky printers
and for sure not used every day. (this keep them going more reliably)
made back in 2008, so is getting long in tooth and on most this full cleaning of the whole printer is advised. ever do that?
per manual?
rtm?
https://support.hp.com/us-en/product/hp-color-laserjet-3800-printer-series/500934/manuals

try cleaning the cartridge using s/w option as well as manually, and you'll find having the solution in hand .

printer says"waste inktank near full" Alarm light blinking.

The other week I had the black print head clog up, requiring daily nozzle deep cleaning [a normal 'ocassional' maintenance function]. Thought I needed a new Print head, so anything worth a try.
I loaded up an old black cartridge [I load all my own......always have] with Isopropyl Alcohol and ran deep clean on that cartridge a couple of times, then repeat printed [6 times] a page full of the number 8 in about half inch character size, to get the alcohol through the nozzles. then Deep cleaned again 3 times, to wash it through the print head.

I reloaded the normal ink filled cartridge and ran the '8' page again till I got good black output. It has now been working without problem, daily, for over a week. Clearly if it's a Magenta only problem, the cleaning as described above would be a bit different, as the magenta is one of 4 colour cartridges.
My printer does quite a lot of work, and was bought at least a couple of years ago, being used daily for alpha numeric and photo printing work. This was the first difficulty I experienced with it.
Hope the above might help.Ken

I have a Lexmark X5495 printer and I had it refilled a couple of weeks ago, suddenly i have a message that goes "Order new ink" or something and i check the cartridge but it is still full. I try restarting the printer and even the computer but the printer STILL won't let me print.

Ive got bad news for you, about 90% of the time black horizontal lines are caused by the panel failing, your going to need a new TV. You can try replacing the timing board but the chances of it fixing it are slim..

It sounds like you have a bad contact between the printhead and the printer. First remove the inktanks. then remove the printhead. Now re-insert the printhead and remove it - do this a few times. What this is doing is scraping off anything that is blocking the full contact between the printhead and the printer. It should only need to be re-inserted like 3-5 times. Then leave the printhead in and install the inktanks and print again. If this does not work call Kodak and request a replacement printhead (they should not charge you its not your fault this is happening) or return the unit to where you purchaced it and ask for a new one. Once you get rid of the problem you will like the printer they do print great quality photos for such a low cost ink.

replace the cartridges

pull out your memory sticks and reboot with one of the two. if you nonly have one barrow one from some one else

I’m happy to assist further over the phone at https://www.6ya.com/expert/james_1cb31da1bc8c6102