Hi everyone, new round I have that old 486 motherboard from the PC of my childhood, but it doesn't seems to work anymore. It was working, and one day for no particular reasons it just doesn't boot again. It was stored for years on a closet, and now I'm trying to restart it. I removed the leaking battery, it could have damaged keyboard circuits (the keyboard is powered as the led blinks once when I turn the computer on, but no clue on signal circuits). First time I started it since years one capacitor closed to the power supply connector burned. I replaced the damaged capacitor (and a second one I was suspecting to be faulty too). Traces of burns on the power connector are only due to my soldering iron (and my tremors !) when replacing capacitors. But the motherboard still doesn't boot. I have an ISA analyzer pc card. According to leds, the power supply seems right. When I turn the pc on, the card gives error codes : First, 0D-0C for maybe one second, then 06-05 and it stays blocked on that code. According to the analyzer card documentation, 0C code could be related to keyboard initialization. Then I'm wondering if the keyboard controller chip is working or not, because when the capacitor burned I have seen a spark between capacitor and keyboard controller chip (LT38C41 chip closed to the power connector). But maybe I'm wrong and the issue is somewhere else. Another information : I get thoses error code the first time I start the computer for a (relative) long time, after that first start if I start the computer again the card doesn't show any code (and doesn't boot neither), I have to press the reset button to get thoses error code again. Any tips or suggestion is welcome Thanks.