Here’s another warning- don’t leave a computer unplugged for any real length of time- I had oen i left unplugged for awhile, in the cellar (which we kept pretty dry- dehumidifier and a nice dry cellar) and later tried to use it again- something happened to it- this thing would not start- it would post- then just turn off- I tried everything to get the thing going- nothing doing- bought several batteries, did the whole reseat memory thing, unplugged everything and tried starting- reset cmos- etc- nothing-
I suspect that even though the cellar was dry, somehow moisture caused some issue I had to junk the computer (it was an older P4 anyhow- wasn’t even worth getting a new M-board and cpu for it- the hardware was all pretty old as well- but it could have been used for basic stuff had it not died-)
IF you are goign to store a computer for any length of time- plug it in from time to time to make sure it’s dry inside, the heat from running should be enough to dry things out
Many electrolytic capacitors fail if they aren’t used regularly. There are even rules in manufacturing about how to recondition capacitors before soldering them if they’ve been stored for a while.