In order to flash my BIOS I have to extract a .CAP file in User to User Help Posted August 5, 2017 · Edited August 5, 2017 by terry1966 · Report reply ok just read old topic here :- https://forums.pcpitstop.com/index.php?/topic/206467-dead-computer-where-to-start/ and am now a bit confused, did you get that pc working or is it the same one your working on now and think the problem with it is the bios for some reason and not anything else? if so what made you think it is a bios problem? this motherboard you want to flash the bios on, you say it's not populated so am assuming you want to use asus flashback feature here :- http://event.asus.com/2012/mb/USB_BIOS_Flashback_GUIDE/ never even knew such a feature existed till i just went looking at the specs of your motherboard. if you want to use that feature then step 3 in my last post when you extract the file it will be M5A99FX-PRO-R20-ASUS-2501.CAP and you need to rename it to X99P.CAP or whatever the tech told you it should be renamed and copy that to the flash drive step 4 is make sure to insert the flash drive into the correct usb port, look in motherboard guide book if not sure because only 1 of them will be correct and work to flash the bios. step 5 would then be to push and hold the button to start the flash as per the guide in above link. to be honest though i don't see how you know if the bios works or not either before or after the flashing without populating it with cpu/heatsink and ram (and graphics card if required) then connecting it to a monitor to see if anything shows up.