Keyboard Failure on boot (DELL OPTIPLEX GX620 DESKTOP)

Try the keyboard on a different USB port. Try a different keyboard. I doubt it is a problem with your BIOS or your RAM.

I tried the keyboard on a different machine and the keyboard works fine. I tried another keyboard on the dell and that failed as well.  I tried all the usb ports on the dell and they all fail.

Note* When I plug the keyboard in the usb port, the Num Lock, Caps Lock and Scroll Lock lights on flash once as if it's getting power. Then no flashes and no function. 

I wonder if the usb connections are not holding the power.  If so, then maybe an external usb hub that is powered with an ac adapter, might do the trick. 

I tried a usb hub, and connecting the keyboard to the hub.  Doesn't work.  I tried getting a PS2 keyboard and connecting it to a ps2 to usb connector and plugging that in the computer.  Doesn't work.  Man, I'm stumped.

I know this is an old thread, but this happened to me and I actually found a solution that works. 

My situation: Dell Optiplex GX620 mini tower. USB wireless keyboard and mouse stopped working - would get Keyboard Failure message on startup and then startup procedure would continue through to windows, but could not log in b/c no keyboard or mouse functionality. System functional, though b/c files on hard drives could be accessed via LAN.

Basically, I believe I reset the CMOS.  Credit for solution to:

http://www.techsupportforum.com/hardware-support/other-hardware-support/202090-keyboard-failure-boot-no-mouse-keyboard-functionality-2.html

Procedure:

- Unplug all devices, turn off/disconnect power

- Press power button for 10 seconds to discharge all power

- Open case (http://support.dell.com/support/edocs/systems/opgx620/en/ug/A02/mtcvrop0.htm#wp1051283)

- Clear CMOS (http://support.dell.com/support/edocs/systems/opgx620/en/ug/A02/advfeat0.htm#wp1132466)

In case anyone is like me (a software person, not a hardware person) - my biggest obstacle was not knowing what to look for, as I always thought "jumpers" were wires.  In this case, the jumper that you remove from the 2 PSWD pins is a small green piece of plastic that you move to the two pins labeled RTCRST (no underscore on my motherboard).  See diagram below. HTH.

I too have been researching this issue for quite some time now.

In my GX-620, moving the green jumper from PWD to reset pins does clears the date/time and IDE settings, but I continue to get the frustrating messages "Keyboard  error" ...  "Press F1 to continue to F2 to senter Setup".

And yes, I have tried several USB keyboards. Even bought a PCI card with PS2 sokets. No luck. :(

Anyone else have a lead on a solution to this?

I, too had the same problem and tried the same fixes, but I finally got it solved

About the keyboard issue that I had. I finally got it solved.
I was working on a friend's Dell Dimension E521 when I experienced the exact same problem---loss of keyboard and usb ports.
I tried all the different ports that were suggested as a fix. None of that worked. Also this machine had no PS2 ports at all.
This is a friend's computer. After thoroughly looking over her computer, I noticed that one of
the front USB ports had a few bent pins. I thought to myself, perhaps that's got something to do with it.
(maybe causing some grounding/shorting problem). So I straightened them out the best I could. Then I did the unconventional,
unspeakable,unmentionable.......I removed the CMOS battery and turned the computer on (WITHOUT the CMOS battery installed).
and VOILA!!!!!  I had a keyboard again. I really don't whether it was straightening out those pins or re-booting without
the battery that actually did the trick but one of them  worked. I don't know if it will help anyone else but it worked for me. So, if you have no
bent USB pins, you may want to try the boot-without-battery trick. (At your own risk)

I, too had the same problem and tried the same fixes, but I finally got it solved

About the keyboard issue that I had. I finally got it solved.
I was working on a friend's Dell Dimension E521 when I experienced the exact same problem---loss of keyboard and usb ports.
I tried all the different ports that were suggested as a fix. None of that worked. Also this machine had no PS2 ports at all.
This is a friend's computer. After thoroughly looking over her computer, I noticed that one of
the front USB ports had a few bent pins. I thought to myself, perhaps that's got something to do with it.
(maybe causing some grounding/shorting problem). So I straightened them out the best I could. Then I did the unconventional,
unspeakable,unmentionable.......I removed the CMOS battery and turned the computer on (WITHOUT the CMOS battery installed).
and VOILA!!!!!  I had a keyboard again. I really don't whether it was straightening out those pins or re-booting without
the battery that actually did the trick but one of them  worked. I don't know if it will help anyone else but it worked for me. So, if you have no
bent USB pins, you may want to try the boot-without-battery trick. (At your own risk)

I have the same doggone problem,, when the e521 boots up it gives me a "keyboard failure" error,

I've moved the wired keyboard through all 3 Usb ports,, all I get is a "yellow" check when it boots up. I get the lights in front 2 and 3 that light up.

I'll have to research what that means, but once I did get into the BIOs, trying the way described previously. Leaving the CMOS batter OUT..

However, once there, I couldn't do anything because the keyboard was inactive/ failed .. so,, nada

I put the CMOS battery back in and boot ed again and again,  from each USB port,, still got the "yellow" check mark from the keyboard with the

"keyboard failure" on the screen.

I've done the switch on the pswd pins to the reset pins,,, let it stay there 5 seconds and put it back on PSWD,, but nothing changed on the POST.

Any more ideas?  Is it the motherboard? I have one to replace this one.

The 620 is one of the models that has PS2 option.

If this board/cable is attached it will have an error if no ps2 keyboard is attached