Hello. Recently bought an Acer "286", model 915. This PC is in very beautiful condition, but when I access the BIOS, it has three options: Hd format, change password and general information. When trying to configure the general information, bios is empty. Not appear the options. It has menu date, time, drives, hd, but without any options. The ESC does not work from there, and no other key. The battery model is the Dallas Real Time, which are without charge. Can anyone help me? Thank you