The white lines at startup

[ed4546]

So I recently upgraded my PC with a HyperX Fury 120GB SSD as my boot drive and at first it was fine but I had to force shut down it whilst booting a couple of times as a fan was being stopped by a Sata data cable which I didn't realise until the second boot that the cable blocking my GPU fan. Anyway, so for a while it booted fine before this (I had to install a Sata power Y splitter after a few boots as I was using my optical drive power cable as my PSU is pretty terrible). Now the issue I'm having, is that when I power on my PC, there is a black screen and there's a white flickering line at the top left of the screen then it goes down by one line and continues to boot as normal. It looks like command prompt basically. Is there a way I can get rid of these? Is it an indication of an error of some sort? Yes I know it is only a minor thing, but it never used to do that.