I got an MS 7390 and lately I updated to the latest BIOS version which is 1.20. I normally use a USB keyboard but when I start up the computer it asks me to press DEL to enter setup. The problem is that the USB keyboard won't respond at that time but only after windows load. The only way to start up the computer is to plug in a PS/2 keyboard, enter BIOS, load optimized settings and save and exit. Then it reboots and starts windows normally.

You need to reinstall the driver of your laptop or update your BIOS to latest version but be careful about updating the BIOS.

Hi,
Unfortunately BIOS reset will not help you, the default setting for USB keyboard support is set to OS and you need set it to BIOS. I would recommend you to go with your mainboard to a specialized service, sometimes the problem is only a defective capacitor. If you reset your CMOS, the first boot device will be set to Floppy. You could try updating your BIOS to the latest version (maybe in that version the USB keyboard is set to BIOS) but I don't know if you can create a batch file to update the BIOS automatically, without confirmation from keyboard... The reliable solution is the technician. You can also try to connect your PS2 keyboard to the mainboard using an USB adapter but as I know in that case the keyboard is treated as an USB device...

If this is the solution for your problem, please rate my post, otherwise give us more details.

Regards,
Andras

move the sata connection for your bootable HDD to another port like 3 or 4 and the bios will detect then run bios setup to boot from the sata 3 or 4 and it works like normal, must be a bug in sata 1 and 2. had same issue trying to install win7 x64. Win 7 refuses to detect sata DVD drive, moved it on the MB and it installed fine.

It could be that your BIOS needs updating for this motherboard. Take note of your BIOS version when your computing is booting. Try hitting the Pause key to freexe the screen, but if no luck go into BIOS and see if the BIOS version is listed. You typically get in BIOS by hitting the "Delete' key on your keyboard when the computer starts up and the first bunch of words appear in white characters (might be a light grey)
Go here:
http://usa.asus.com/product.aspx?P_ID=dJ2XP7zr8tzeYbLp&content=download
Latest BIOS (note its a beta version ie not formally released) is
K8V-MX Beta BIOS 0501
Latest beta BIOS.

Try reflashing your bios with latest version check usb is enabled in BIOS if your using a usb keyboard otherwise maybe a dodgy board. Good luck

Please enter CMOS setup and verify that the USB port is enabled.

Have you tried enabling usb legacy support in the BIOS?

Go to bios in motherboard configuration, sometimes called peripherals in bios find legacy support and enable it. It will help us to know which Dell do you have.

just for once update the latest version of 7390 software and try it once.

update the software of latest version of nokia 7390.