I have an HP 610 laptop which appears distorted on bootup (bios options etc unreadable), and undistorted but with a yellow tint on windows login screen.
I have tried a working screen and screen cable and have had no success.
Also, if I boot into the BIOS, it appears fine.
I would say this is a Graphics chip Problem, not Screen. That means a new motherboard as its part of the Motherboard.
PS I have the HP 510
As it seems okay in BIOS you could try new graphics drivers
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