I'll try to be as concise as possible:
I am not very familiar computers - I am working on a PC build, and while I wait for the parts to arrive I've decided to try to bring some new life to a few old computers I have.
The machine is an old dell optiplex, the hard drive was dead so I put a different used HDD in and used Rufus to put Lubuntu 18.04.4 on a flash drive. Installing it on to the HDD seems to go fine, but when I reboot the system from the HDD the screen just freezes on a seemingly random color - the same thing happens when I choose the "try lubuntu" option
I will attach some pictures I took of what happens when booting
https://ibb.co/x6kjxk3
https://ibb.co/dmsDvj8
https://ibb.co/Bnmg2Yg
https://ibb.co/mR614gM
The first time I booted it showed that strange pattern, every time since then it has been just a single color on the whole screen; black, blue, green, orange
Any help would be appreciated friends
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