So it's kind of a long story but I am trying to get into the bios on a 486. The board is used in control modules for old CNC engraving machines to receive the data and it control the motors and power. The manufacturer has an I/O card that plugs into the ISA port that has the data and firmware. When the computer boots up it loads the card. When the battery dies and the CMOS is cleared it no longer loads it up. Well I am trying to repair two of the control modules. I have a third control module that works and when I install a graphics card to go into the bios I get video no problem. However when I install the graphics card in the two control modules that don't load the I/O card, I don't get any video. They do power on but no video. Tried two graphic cards and they both worked on the working control module. I removed the battery last night from both of the non working boards and did notice some corrosion that I hadn't seen when the battery was in the way. I plan to clean the board and remove the corrosion. It didn't seem too bad but I'm not sure if that's the reason for the issues. I am at work right now and don't remember the motherboard model or have any pictures. I can post some tonight. The working 486 is newer then these two boards. I was wondering if I needed drivers to get it working or if the leaking battery might be the issue. Any advise is appreciated! Thanks.