Backlight problem, very weird

Hi!
I have a HP 6730s laptop, the screen had a vertical green line in it so I decided to switch the panel out. I actually had an extra display assembly from another machine(same type). I tried it out but the backlight was not working, the display itself was fine. I installed the CCFL tube from the first previously working panel and it still wasn't working... I tried every combination of the cable,inverter,ccfl tube, lcd panel, but the backlight wasn't working. The machine works on an external display. I had a Linux Mint install on the machine, I decided to start it up and as soon as I hit enter in grub to start it, the backlight comes on! It is working flawlessly under linux, even brightness control, but not in the bios or in windows. Anyone have any ideas I could try to fix this? I don't have the funds to get another machine, even second hand, and I need this one with windows for school work.
I tried: 
unplug, take out battery, take out RTC battery, reset bios
reflash bios (would not let me flash a previous bios version, just the current one which is the latest)
The machine has an integrated Intel 4500MHD graphics adapter.
Summary: backlight won't work in bios/windows, works flawlessly in Linux Mint.

@szemenyeigy 
‎Thank you for using HP Support Forum. I have brought your issue to the appropriate team within HP. They will likely request information from you in order to look up your case details or product serial number. Please look for a private message from an identified HP contact. Additionally, keep in mind not to publicly post ( serial numbers and case details).
If you are unfamiliar with the Forum's private messaging please click here to learn more.
Thank you,
Omar
I Work for HP

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