I bought this laptop 2 or 3 months ago for our first Ubuntu-only computer. Model 80E3, S/N PFOESNH5. Before putting in the battery or starting it for the first time, I swapped the factory HDD with the OEM Windows 10 pre-install for a new Samsung 850 EVO SSD. I also removed the factory 4GB 1600 RAM and put a stick of 8GB 1866. Then I installed Ubuntu 14.04 from a USB flash drive, letting Ubuntu auto-configure the partitions (BIOS is set to UEFI mode). I have been having constant system lockups/freezing with green lines across the screen, for no reason the computer restarts itself, and it doesn't like to install Ubuntu base updates. I discovered that I hadn't disabled secure boot in the BIOS, so did that and re-installed Ubuntu, but it hasn't helped. I just double-checked the BIOS version and found it has A2CN4OWW, while the Lenovo support page for this model says the newest BIOS version is A2CN38OWW. I also checked the RAM for errors with 6 hours of memtest, and found none.
A few days ago I built a new mini Ubuntu PC (also Ubuntu-only, no other OS), and have not had a single problem with it, so I know I didn't make any mistakes with the installation. The only thing I did differently was manually configure the partitions, following advice from experts in these forums.
I could sure use some help! Has anyone with the same, or a similar laptop had problems like this?
[ubuntu] Lenovo G50-45 laptop freezes with green lines, restarts itself, refuses base updates
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