Grey screen when trying to get into Bios

[Lankoss]

So last night I noticed that my overclock was no longer active on my CPU. I decided to go into the bios and see what was what, but whenever I try I get a grey screen which flicks from grey to black when I press the f2 button. If I then press ESC and Enter it takes me to a blue screen, if i press Enter there it takes me back into windows. Its almost as if I cam getting into the BIOS, it just isn't displaying correctly, Im not 100% sure about that though. I have disabled SLI and tried that way also, but no change. I am also trying to boot into windows by using the "Update and Recovery" option as it's Windows 8.1 so I dont think you can get into the bios by just restarting the PC normally.

I have tried pressing DEL and F2, both bring up the same grey screen. If I don't press any button while its restarting, it takes me straight to the blue screen, I then press enter and it takes me into windows.


GPU - 2x MSI Lightning GTX 780's SLI
PSU - 850W Corsair HX Series
CPU - Intel i5 4670k overclocked to 4.3GHZ (Now shows as 3.7ghz when stressed through AIDA64)
Cooler - Be Quiet Dark Rock 2 air cooler
motherboard - Gigabyte sniper M5 micro ATX Z87
SSD - 480GB Crucial M500 SSD
HDD - 1Tb HDD
RAM - 8GB of Corsair Vengeance Pro Series @ 2133MHz
Windows 8.1
144hz 1440p Asus Monitor


Any suggestions welcome.

 

[Lankoss]

Edit: I've got into the bios now, for whatever reason it wouldn't display with the DP cable but worked fine with the HDMI. I've reset my overlock, I just used a multiplier of 43 and 2.2v. I have only stress tested it for 10 min but so far seems fine. I'm happy with 4.3 so I'll leave it at that I think as temps are fine, a core will jump up into low 60's every now and again but the CPU temp fluxuates around 52-55C so more than fine with that.