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204
January 13th, 2024 20:34
Optiplex 9020 MT can't access BIOS
When I tried to change my 9020 MT's BIOS from Legacy to UEFI, there was no Boot Sequence shown. Instead of changing back to Legacy, I hit Exit instead. BIG mistake!
Now I can't access the BIOS by hitting F2 during power up. Just a black screen. I removed the battery, waited a few minutes and reinserted it. That didn't help.
How can I access the BIOS again? TIA.
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redxps630
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15.2K Posts
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January 14th, 2024 00:23
Replace cmos battery with a brand new one. If still can not access bios, try clear cmos settings by motherboard jumper.
you can change to UEFI. You would need to do a clean install of Windows by boot from a USB or DVD first. The old OS that ran in legacy mode would not boot in UEFI.
mjt4283
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January 15th, 2024 15:53
@redxps630
Thanks. Replacing a new battery did not fix the problem. Where is the clear cmos settings jumper located on the motherboard?
redxps630
9 Legend
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15.2K Posts
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January 15th, 2024 18:19
At bottom of motherboard says RTCRST
mjt4283
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January 21st, 2024 17:13
@redxps630
That solved the problem! Thanks.