Years ago I spilled some thermal paste (I think it was Artic but I'm not sure) on one of the RAM slots of my motherboard (ASUS Z-97 Pro Gamer).
If there's RAM installed in that slot, the PC wouldn't boot. If there's no RAM in that slot, the PC boots normally.
I was afraid of cleaning it so I...
So my son wanted to play Minecraft and moved my coffee to ON TOP OF MY PC!!! (I'm so mad) some coffee spilled into the system causing it to freeze, the mouse cursor wouldn't move and the pc wouldn't turn off using the power button so I turned it off at the socket. Left it to dry then tried...