Member Avatar for cmrk07

Hi, I am having an older AMD Machine with 512 DDR Ram. My os was corrupted. So inorder to setup BIOS boot priority i am unable to open the CMOS.

I don't understand the reason.

Kindly help me in this matter and appreciation to you.:-/

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For : a quick clarification first — "CMOS" is often used to mean the BIOS setup screen, but technically CMOS is the small battery-backed memory that holds BIOS settings. Not being able to reach the setup program can come from several hardware-level causes (keyboard not seen at power-on, a locked or corrupted BIOS, or the board skipping visible POST messages), so treat the problem as a mix of input/firmware/hardware checks rather than a single step.

As and suggested, try entering setup during the very earliest part of boot. If that fails, work through these targeted checks in order:

  • Try a different keyboard and different connector type. Older AMD boards often respond more reliably to a direct PS/2 keyboard than some USB keyboards or hubs.
  • Unplug all nonessential USB devices (external drives, hubs, cameras) so the board isn't held up enumerating them.
  • Verify the monitor actually shows POST — some systems default to a different video output or the screen stays blank and you miss the prompt.

If the above doesn't help, reset the BIOS settings (this clears custom settings and any setup password): power off and unplug the PC, remove the coin-cell battery for a few minutes or use the motherboard’s clear-CMOS jumper per the silkscreen/manual, then reinstall and boot. Always remove power before touching the battery or jumper and avoid shorting other pins.

If reset still doesn’t allow access, try a minimal hardware boot (one RAM stick, no drives, onboard video if available) and listen/watch for beep/display codes. Note the motherboard model printed on the board and consult its manual for the exact setup/clear-jumper procedure or recovery options. If the firmware looks corrupted after these steps, consider a service shop or a board-specific BIOS recovery/flash procedure rather than continuing blind troubleshooting.

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Member Avatar for rch1231

Hello,

Depending on the BIOS version it is usually either the DEL, F1, F2 or F10 Keys to enter BIOS. Try this, when the system is booting watch the keyboard and the NUM Lock, CAPS Lock and Scroll Lock lights will flash.... as soon as that happens start hitting the DELETE key and see if it kicks into the BIOS, if not do the same thing again and try the other keys.
Another option is some BIOS use F12 as an option to go to a boot selection list.

Member Avatar for benmar

rch1231 is right try to hit all the keys he mention above..

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