@thomas-pondant,

Textbook answer. Using both of those means are the correct way to do so.

Having used both, I can say that in my experience, it works...once and only once.

The second time...not so much.

Manually, you can take isopropyl alcohol with a cotton swab and gently rub away the dried up ink until you see a clean surface. Then take the cartridge and tap it against a a surface (covered with a paper towel) to get the ink to prime the pin holes.

put it back in and try and print.

I would start with upgrading the BIOS, Video Drivers, Chipset drivers for your OS. Check the refresh rate and display size is fine. When you first turn on the laptop do you see any dead pixels on the black screen? Could be a power supply issue causing it or a bad motherboard with onboard video.

Make an Ubuntu Live Boot CD or USB drive and boot it. Let it find the hardware. See if the green line still appears.

Romona,
I will put it on the list as a request..but we're not planning it yet. Our schedule, now that we've put out the core of our courses is really based on demand! So...if there's a high demand we'll probably do it!
Cordially,
Ronnie Wong
Host, ITProTV