wow... that does suck
I always switch off the power on the PSU while working on the system, while it is still plugged in that way it is grounded/earthed 😀
if the power isn't switched off, there is always a little bit of power going to the motherboard... that's how the power on jumper stuff works 😉

The USB keyboard should work in the POST and BIOS settings. The USB setting inside the BIOS is for make it work AFTER the POST.
Usually those adapters doesn't work, at least for me... you should try a real USB keyboard.

Maybe the fuse near de ps/2 connectors blew up ?

I got a cheapo PS/2 > USB adapter here... worked just fine on my dell desktops... I "adapted the adapted" (plug crappy mitsumi AT keyboard connector to PS/2 converter, then converter to USB adapter) and it worked fine... mine has a separate pigtail for a mouse too

my adapter behaves like a real USB keyboard

but... I agree, try a real USB keyboard also... not all USB adapters are the same 😀

Try a PS/2 keyboard with USB adapter in a USB port. I once had the same problem (how it happened I know, but WHY is a real mystery?) and a normal USB keyboard would work at the prompt, but not in the BIOS, something like that. And because I couldn't use it in BIOS, I couldn't set the USB legacy. Sorta a catch-22 situation.

After a while I wanted to try the PS/2 keyboard on USB port thing, but THATS when I fried it...RIP A7V333 🙁

Edit:And no, it fried because I had the clear-cmos jumper on it and plugged the power cord in)

that's what he did
he plugged his PS/2 keyboard into a USB adapter and tried to boot up with it... it doesn't work

TheMAN wrote:

that's what he did
he plugged his PS/2 keyboard into a USB adapter and tried to boot up with it... it doesn't work

He mentioned USB 2 PS/2, I mentioned PS/2 2 USB, it's the other way around 😉
Though a "USB-2-PS/2-keyboard" doesn't make a lot of sense, technically

This is what I meant - I tried to use my PS/2 keyboard in an USB port, using that type of adapter that also has a green pigtail for connecting a PS/2 mouse. I'll borrow a "native" USB keyboard from work today, to see if it helps.

I also thought there would be a fuse somewhere in the PS/2 connector's area, but I cannot identify it on this board (on any board I have, in fact).

Cheers for clearing things up 😉

I've had the "exact" same problem once:USB keyboard works, but is disabled in the BIOS by default (rather stupid ehh).

Thinking about it, the only way out of this that I can come up with is to download an appropriate BIOS file for the board, mod it to enable USB legacy support (or whatever the exact name is) and flash it to the BIOS chip on another board using the hotswap method.

OR put this modded BIOS file on a bootable flash diskette, insert it and hope you can still flash it's BIOS using the USB keyboard.

A USB keyboard should work in POST (so you can enter the BIOS), and in the BIOS setup. The "USB keyboard enable/disable" option in BIOS is for AFTER the POST, to be able to use the keyboard prior to the loading of a OS, or in DOS, for example.
At least that's the case with 99% of the mobos I used. If it didn't worked was because of bad BIOS programming (it didn't occurred to them, so didn't implement it). I don't think this is the case here since it's a very "new" ASUS board, USB kb should work in POST screen.
What I'm trying to say is, if that adapter didn't work, it should be the fault of the adapter.
If the USB kb doesn't work, then I don't know.
Maybe the USB ports fried too ?

EDIT: i've looked at a photo of your mobo. The fuse is the green thingy that's just at the back of the PS/2 connectors. It's called a resettable fuse I think. I'm probably wrong here, but my understanding is that they never broke ? or something like that.

On some boards only certain USB ports work for the keyboard. Try the two at the top right underneath the PS/2 ports.

Mau1wurf1977 wrote:

On some boards only certain USB ports work for the keyboard. Try the two at the top right underneath the PS/2 ports.

This is a good tip! I'll remember this one, cheers!

Well, no luck with the USB keyboard either (tried all four external USB ports)... I'll do some search about the fuse (and maybe measure it to see if it's interrupted) - there are three green thingies in that area though, are so many fuses necessary there? 😀

I'm not sure the USB ports are fried too - when I plug the keyboard (either the USB one or the PS/2 onewith the adapter), its LEDs do blink once...