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Post error: BIOS not supporting boot device

All,
I have an Asus P8Z77V Pro/Thunderbolt motherboard with an NVIDIA 660TI video card.

This rig has been working without issue for almost a year. Unfortunately, the last few days I've been unable to boot into the machine. When booting, my computer prompts "The current BIOS setting do not fully support the boot device. Click OK to enter the BIOS setup. Go to Advanced/Boot/CSM Parameters, and adjust the CSM (Compatibility Support Module) settings to enable the boot device.

I have a Samsung 840 SSD. This has worked without issue for about a year. Now, however, I can't boot into Windows, nor can I get into the BIOS to fix this CSM issue.

Any idea how to fix the issue, or what might be the cause? Does it sound like a SSD problem, or a motherboard issue, or something else?

I'm using the latest firmware for my BIOS.

Thanks!
Reply to MattB2013
10 answers Last reply Best Answer
More about post error bios supporting boot device
  1. did u Install any new hardware?
    Reply to gokul36
  2. Nope. However, what I noticed now is that when I try to access the BIOS, the hardware time has been reset and there are no longer any bootable devices, including my DVD player. None of the devices plugged into the SATA ports on the motherboard seem to be working.
    Reply to MattB2013
  3. I think ur MOBO is faulty or try to change CMOS battery
    Reply to gokul36
  4. Damn. I already tried clearing CMOS and I removed the battery.
    Reply to MattB2013
  5. Motherboard fault
    Reply to gokul36
  6. Best answer
    I doubt this is the motherboard. Put a windows disk in the DVD drive and boot to it. If you can get past the BIOS screen booting to a DVD/USB/other HDD, the SSd is bad NOT the motherboard.
    Reply to tiny voices
  7. I went out and bought a new Intel SSD. After I unplugged all my SATA hard drives from the motherboard and plugged in just my DVD player and new SSD, the motherboard detected it right away. I was able to install Windows onto the new hard drive, but on the first boot (immediately following installation, never made it to Windows), the Boot_device_led is on. It turns on almost immediately. I am unable to access the BIOS.

    Interestingly, if I unplug the hard drive, I'm able to get into my BIOS.

    Motherboard screwed up?
    Reply to MattB2013
  8. yep! i already told u....it's Motherboard fault
    Reply to gokul36
  9. MattB2013 said:
    Nope. However, what I noticed now is that when I try to access the BIOS, the hardware time has been reset and there are no longer any bootable devices, including my DVD player. None of the devices plugged into the SATA ports on the motherboard seem to be working.

    Hi matt,
    Did you find the solution?? I'm facing this issue now..
    Reply to Thilagarajan
  10. I had this problem. What worked for me was swapping sata cable on the motherboard to a different one and I used a new cable.
    I use:

    Asus PBZ77-V
    i7 3770 cpu
    16GB RAM
    GTX1070 x2

    The machine its just a render node.
    Reply to lmokoena7
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