It's a command to check the integrity of the OS against the recovery partition (if you have it) and repair any system files that may have been corrupt.
I think earlier in the thread you suggested BIOS flashing. If you are comfortable doing that sort of thing, then take a backup of your current BIOS, then grab the identical same BIOS for your specific model off a place like Techpowerup while also getting another BIOS from a competing brand that is similar TDP (Perhaps check the EVGA base XC model and Asus TUF). Try the identical model BIOS first, if no different you could try a competing brand BIOS.
Remember that if you screw up a BIOS flash you can recover, but you need to have an iGPU or secondary card you can plug in on standby for that. Technically a card with dual BIOS here can save you too, but I think the Eagle lacks that over the Gaming OC.