Advice.....Flashed BIOS on ASUS Crosshair VIII and now it won't find BOOT SSD

Flashed BIOS successfully.
PC booted fine before I flashed it.
Now the board won't boot to Windows which is on a SSD.

The BIOS can "see" the SSD but does not list it in Bootable discs

I can "override" through the BIOS but if I shut down the PC......same problem.

If I override, all is fine.

magoo said:

but if I shut down the PC......same problem.

Click to expand...

Replace the CMOS battery.

First of all, the board is brand new and the battery is fine.
Removal and replace will do nothing but reset the BIOS to defaults, which I have already done without any change in the problem.

My problem is ......."cannot locate MBR" which would reside on the OS Drive......

magoo said:

Removal and replace will do nothing but reset the BIOS to defaults, which I have already done without any change in the problem.

Click to expand...

Dude, don't be rude.

Historical evidence will back up my battery-yank trick as an "easy out".

As for your master boot record, that means your hard drive is corrupt dunka-dunk.

No wonder it won't boot..

I might try doing the flash with ASUS USB BIOS Flashback method. That and try doing a full clear mos.
Was your windows install a UEFI install or MBR?

Its like the bios gets confused when its looking for the wrong type
sometimes.

If I'm not mistaken......

I may have a situation where the UEFI BIOS is failing to recognize a legacy MBR.

If my C drive was corrupted then I doubt if it would operate normally when I go into the "Boot-overide" slot in the Boot section of the BIOS.
As I said in the OP, I can't boot normally from a power on.
If I power on, the computer will boot to the BIOS only.
If I close out the BIOS the computer restarts into the "cannot fing MBR"
If I restart from power on, go into BIOS, go to BOOT, and select "override" the computer will boot directly into the C drive as it should and function properly.
I could BOOT like that forever, but it would get a little old.
Another choice would be to reinstall the OS from scratch, since all it has is the OS.....but then i would just be end-running the problem.

I'm trying to understand why the BIOS will not recognize the MBR format following a BIOS update where-in it was functioning properly before that.
The new BIOS was successfully loaded. I did reflash it when I thought I had made a mistake, but I don't think the flash corrupted the C drive.

I have read where UEFI and MBR are sometimes incompatable.
I'm trying to gain perspective.

magoo said:

If I'm not mistaken......

I may have a situation where the UEFI BIOS is failing to recognize a legacy MBR.

If my C drive was corrupted then I doubt if it would operate normally when I go into the "Boot-overide" slot in the Boot section of the BIOS.
As I said in the OP, I can't boot normally from a power on.
If I power on, the computer will boot to the BIOS only.
If I close out the BIOS the computer restarts into the "cannot fing MBR"
If I restart from power on, go into BIOS, go to BOOT, and select "override" the computer will boot directly into the C drive as it should and function properly.

I'm trying to understand why the BIOS will not recognize the MBR format following a BIOS update where-in it was functioning properly before that.
The new BIOS was successfully loaded. I did reflash it when I thought I had made a mistake, but I don't think the flash corrupted the C drive.

I have read where UEFI and MBR are sometimes incompatable.
I'm trying to gain perspective.

Click to expand...

for what its worth...you want a UEFI install anyway. you can actually convert it inside windows, as i had to do this once and your bios will be able to see the os drive afterward...think i should have been calling it legacy install. You want a GPT with UEFI in the end anyway lol

Regardless im sure the bios is LOOKING for UEFI install and you actually installed in legacy. I have pretty much the same board as you and ran into similar situation a while back
type msinfo32 and check and see if it Legacy or UEFI

Enable CSM (Compatibility Support Module) in the BIOS.

Azrak said:

Enable CSM (Compatibility Support Module) in the BIOS.

Click to expand...

this i DONT recommend messing with...it only caused me issues on this board, but who knows? But i like running in UEFI mode

Convert mbr to gpt, turn off csm, uefi boot.
Do a chipset driver reinstall if paranoid in safe mode.

have you looked in disk management to see if the ssd is still the primary bootable drive?