PROBLEM ENTERING THE BIOS, MARC: DELL, MODEL: OPTIPLEX 390, it has the administrator password, and I cannot enter the bios, it is blocked when trying to enter the bios by pressing f12 asking me for the password, YES if it allows me to enter the bios and today He doesn't let me in, but it already blocked me more, yesterday he let me see the bios menu, but he couldn't configure anything, today he doesn't let me get to the menu. Any suggestion or recommendation for me is good. I already removed the battery from the bios, I already removed three jumpers are the only ones that it brings on the card, and nothing that restores the bios, and uuppss, well I hope to count on the help of your bald knowledge. THANKS; GREETINGS, PEOPLE

Good night, analyzing your case I will guide you: you must go to the following link http://www.dell.com/support/home/co/es/cobsdt1/product-support/product/optiplex-390/manuals You must choose the type or format of your case (PC case), although the manual should not vary as to what will be investigated, for this case take the first option "computer monitor" as an example and download the manual that comes in Pdf format; you open it and go to page 54 "system configuration program" you must read very carefully all that chapter where you indicate the series of keys that you must press to access the boot options of your pc and the configuration of the BIOS. regards

good afternoon companions, THANK YOU, for your valuable support, I inform you that my problem has already been solved, in my case it was solved by changing the configuration of the jumper, and it was not necessary to apply more tests, and on the ideas of the comments thanks for that in my case is good buy, orita would be applying, thank you thank you