2 Intern
•
58 Posts
•
172 Points
0
129
March 10th, 2026 03:21
Keyboard not detected
I have an optiplex that does not detect the keyboard so I cannot get into the bios. It keeps showing keyboard not detected. I tried the recommended steps remove the battery etc still nothing a ps2 keyboard also refused to work.
I am out of ideas. Could this be a defective motherboard?
thanks
No Events found!
bradthetechnut
9 Technologist
•
9.5K Posts
•
40.3K Points
0
March 20th, 2026 02:04
You already tested a different motherboard and it worked. I guessed it might be MB before that and you basically confirmed it and thought it might be the MB.
bradthetechnut
9 Technologist
•
9.5K Posts
•
40.3K Points
0
March 10th, 2026 04:47
You removed the battery, but did you replace it with a new one?
What model is your Optiplex?
Jon139
2 Intern
•
58 Posts
•
172 Points
0
March 10th, 2026 17:32
@bradthetechnut Yes i changed the battery the pc is an optiplex 9020 MT.
bradthetechnut
9 Technologist
•
9.5K Posts
•
40.3K Points
0
March 10th, 2026 22:06
I take it your main keyboard is wired? Might have to reload OS. Not too many ideas I have for it. If reloading OS doesn't work, motherboard may be faulty.
Jon139
2 Intern
•
58 Posts
•
172 Points
0
March 11th, 2026 00:27
@bradthetechnut Yes the keyboard is wired I tried both ps2 and usb. Reinstalling the os? It is a fresh install I tried 2 different ssds same result. Maybe I need to get into the bios to change the settings. I also tried a linux mint drive no response. It cannot see no boot drive and no keyboard is recognized. I have an identical mobo that works without any problems with the drives
It's probably motherboard itself.
(edited)
redxps630
11 Legend
•
15.8K Posts
•
81.3K Points
0
March 11th, 2026 00:55
Before you call it a bad board try clear CMOs by putting jumper on RSTRCT pins.
bradthetechnut
9 Technologist
•
9.5K Posts
•
40.3K Points
0
March 11th, 2026 04:06
What redxps is getting at is a BIOS reset. Place blue jumper from PSWD pins to RTCRST pins. Plug in PC for 10sec. Unplug and place blue jumper back on PSWD pins.
Jon139
2 Intern
•
58 Posts
•
172 Points
0
March 11th, 2026 18:13
@bradthetechnut Yes I tried it. The fans started spinning loudly after I removed the jumper from. With the jumper now back on the pswd pins the pc doesn't turn on anymore.
(edited)
bradthetechnut
9 Technologist
•
9.5K Posts
•
40.3K Points
0
March 11th, 2026 23:01
PC should be unplugged whenever working on the inside of it. I think the motherboard may be a brick now. Checking the PSU is a shot to see if it's still good.
How to Run a Power Supply Unit Self-Test On a Dell Desktop or All-in-One Computer
Jon139
2 Intern
•
58 Posts
•
172 Points
0
March 12th, 2026 03:54
@bradthetechnut It still works after I left it unplugged for a while. However the original problem is still there. No keyboard is not recognized on any usb or the ps2 port.