Bios Screen is green, but windows is not.

Bios Screen is green, but windows is not.
Video bios screen color messy

Alright so here’s my problem. After long periods of time with my newly upgraded desktop, when I reboot the Bios screen is tinted in a green color but in windows is normal. Now my pc runs completely fine. Everything functions as normal, unit is stable in windows, benchmarks are equivalent to similar builds if not better in some cases.

Specs:

CPU: Ryzen 7 2700x

Motherboard: Asus ROG Crosshair VII Hero

RAM: G.Skill Trident Z RGB 32gb @3200mhz kit

GPU: Asus Turbo GTX 1070ti 8gb

PSU: EVGA Supernova 1000watt

Primary Boot Drive: Samsung 860 evo 500gb SSD

OS: Windows 10 Home (Originally windows 7 but was upgraded during the free windows 10 upgrade)

I first discovered this issue when running benchmarks and I wanted to adjust my cooling fans for my radiator in the bios. I was running quite a few benchmarks the PC was running fun etc etc. So I rebooted my desktop to the bios… and the screen was tinted a green color but when I go into windows it was completely normal. At first I was worried my new graphics card was defective so I turned off the unit. I swapped my gpu out with my brother’s gpu he had in his system (R7 370). But the screen was still green when I booted it. I even swapped an ancient HD5450 I had laying around to check. But again the bios was still green. I also hooked it up to my other monitor to check, but the bios was still green tinted.

So maybe it was my motherboard? Well I contacted Asus to see if they can help, they gave me the standard testing procedure, I spent 2 hours reflashing the Bios with every FW version available. After that frustration of getting no results of flashing the bios I decided to mess around in the bios. Well I discovered something odd… when I disabled CSM completely, the bios goes back to regular colors but I cannot boot to my boot drive because it requires to run with CSM enabled with legacy mode enabled. I requested to Asus to have their engineers test this configuration to see if they could replicate the issue but they claim they couldn’t replicate it and said RMA the board. Well I received my replacement C7H motherboard. I took my entire pc apart and put the new board in powered on the system. Looks good. Well after a little while I reboot to ensure the problem goes away. Well it didn’t I wouldn’t be writing this up if it did.

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So now stumped. I decided more trouble shooting. I tested each of my sticks of ram by them selves. Still same issue. So far I’ve ruled out Graphics card, Motherboard, and memory. I really have my doubts about it being the CPU but anythings possible at this point, not too mention I really don’t want to RMA the CPU too and turns out to be something else. And remember the system runs completely stable. I personally think it might be some sort of firmware bug but I can’t confirm it myself. Tho maybe it could be windows 10 too? But would windows 10 effect the bios being tinted green??? Tho it is strange that disabling CSM completely fixes the problem… Mean I’m completely just confused, and this has to be the strangest thing I have ever seen. Mean I’m a repair technician for servers and I’ve seen some really weird stuff over the years.

Mean seriously what could cause this??? Has anyone ever seen this before or encounter something like it or anything!?