Dell Optiplex 620

I just got an Dell Optiplex 620 , and since i got it all it brought me was trouble , i guest that's why i got such a bargain .
WD Caviar SE SATA HD 7200 RPM X2
512 MB PC Samsung memory X 4
3.8GHzPentium 4 HT Processor
This Machine has a total of 8 USB ports (2 in front)
Ethernet adapter , Graphic card sound card on-board.
It had windows XP pro installed and running normally but i couldn't get the computer to recognize my USB keyboard nor my Mouse, i cannot do any configuration in the bios because it doesn't have any PS\2 ports , so i use a serial Mouse and i connected it to my Network trying to install the needed drivers and when i restart the computer the serial mouse stop working , i tried to shut it that by pressing the power button (not holding it until it shuts off ) and while the windows was shutting down i got this blue screen witch i'm sure some of you have experience .
Technical Information
*** Stop: 0X0000007E (0x0000005,0XBABB09B0,0XBACE79BC,OXBACE76B8)
*** Kbdclass.sys - Address BABB09B0 base at BABB0000,Datestamp 41107b08
.
I could of gone to safe mode and try to fix it but any USB keyboard i use seem to work . I ask any off you have experience something like that to please help me . thank you.

I have had alot of gx620's in the past and very few problems...

What kind of keyboard do you have? where are you plugging in? I don't know if in actuality it matters... but I usually plug in the same way I would a ps2 keyboard. I plug the keyboard in the top left most usb slot, and the mouse in the one next to it.

plug the keyboard in, power on and just keep pressing F2.

other troubleshooting steps you may want to take : Remove all but 1 ram stick ( leave the stick that is closest to the cpu )

I've literally had dozens of gx620's, gx520's and I don't think I've ever had a usb issue.

Check the BIOS to make sure you have USB keyboard and mouse enabled.

Try a different USB keyboard. Without PS2 ports, USB would be enabled by default.

Sounds like you need to do a windows repair or fresh install.

a clean install will do the trick!

maybe you should try getting a pci - sata card, or a pci - ps2 card to see if that lets you use ur keyboard.

Hi. I have the same problem with the same model, however, my gx620 can't even past the post seccion, after the dell's initial screen it says there is a keyboard error and stops there. Since usb doesn't works, can't press F1 to continue neither F2 to go to bios.

Did you solved your problem?

I did, it was the same as in the back doors, no keyboard detected, no bios acess, no boot, no nothing, it just stays there waiting for a keyboard input (f1 to move on, ignoring the errors and F2 to enter the bios). It doesn't even gets to the part where dispalys the amount of ram...

And the keyboards (2 of them) I tried (one corded, other wireless) are not original dell. Wireless one is microsoft wireless desktop keyboard 1000 and the other is some rubbish white brand.

Might this be a problem? Not all keyboards are born equal, but it's just a keyboard...

Yes, it should, but as the author of this one had the same symptoms I did, and the thread is nearly one year old, I would like to know how It did turnout to him...

And since the last post was about 7 or 8 months old, I hardly can be acused of hijack someones else thread, after all, it was abandoned.

Thanks for the replying.

The dell gx620 has no ps/2 connctors, otherwise I would have already tried them...

There are only USB's.

And because of that I can't go into bios and do what you said - thats why I would like some input from the original treader, to know how/if he solved yhe problem...

And from what I understood from this model manual, the default settings for usb keyboard and mouse is on... so thats probably not the problem. I guess it's realy something to hardware level, like burnt logic or whatever...

USB is great, until it stops working or giving headaches like bad connections, drives and inputs going randomly down, etc...

This sucks

I did removed the battery and cleared cmos (actualy its labeled as som rtc_clr or something), altought not for five minutes.

Anyway, only after new year I will be able to test it, I'm out for the holidays and wont take the hardware with me.

Then I will try that, thanks.

Have a Happy Holidays!

I haven't reply to this treat because i haven't receive any relevant suggestions , i did buy a USB pci card it works after windows starts and not before so i cant make any changes to the bios if i wanted to.

Thats what happened to me, only with me it was worse:
Since there is no working usb, bios doesn't detects keyboard and because of that, the boot hangs in the keyboard error. Can't go to Bios to remove the keyboard error halt.

So, I dont even get to disk/windows... just get stuck in post where it says to push F2 (or is it F12, can't remenber right...) to go into BIOS, but... I can't, there is no keyboard detected...

It's simply a dead end. I think I'm going to ditch the dell and just put toghether a cheap system. Only regret I can't even reuse the dell desktop case, I kind off like it, but it's for BTX boards and more pain than it's worth it to make compatible with mATX.

Thank you all.

OK so let me get this straight.
windows works but you have no USB ports so your mouse and keyboard will not work and you can't even get into the BIOS, correct.?
please fill me in if I am missing something..

Mine said the same thing, gave a floppy error. I then attached a floppy and the error was gone. Then it gave me a hdd error. I connected a ide hdd and solve that one too. Only the cursed keyboard error can't be removed, since the board can't detect the usb keyboard and there are no ps/2.

Who was the genious that thought that it was time and a good idea to remove ps/2 connectors from motherboards?

^
NICE...

The manual states a clock reset jumper, not bios reset jumper...

Unfortunately, that won't work, because the dell gx620 doesn't posesses standard connectors, they have smaller and closer pins than standard connectors (those are like hdd ide or floppy pins ).

Theres a ser2 connector which as a serial port and a ps/2 port on those pins but I can't find the pinout diagram anywhere. If I could, I would try to connect to a cable similar to that one you refered that I have somewhere and would give it a shot...

I know there's a dell cable that connects to this ser2 and add's a ps/2 plug in the back of the box, but even in ebay those are a little expensive, not to mention it may not solve the problem or even create a new one.

I think the best is to get a new cheap mobo and reuse all the other stuff and a old atx case I have around...

Are you talking about the main chipset or some smaller one?

I see one chipset labeled nh82801gb and another one wich is unindentified but as a heatsink on top. Then there are other smaller chips, one is broadcom, other smsc...

However, I just gave the board a look and can't see anything burnt, everything seems to be ok.Do you have some more info?

Thanks anyway.

I would also check all capacitors on the motherboard... Dell amongst other companies had major problems with leaking caps a few years ago (The Optiplex GX620 was one of the affected machines).

Signs of bad caps include bulging, fluid or corrosion around the base of the cap (on the motherboard itself), Brown or yellow "goo" on top of the cap... Leaking capacitors also have a distinct smell (similar to cat's p*ss in my opinion).

Try another keyboard, and another, and another...

I have 2 620's and they are picky about keyboards at the BIOS level that work fine once XP is booted.