Water damage can be irreversible. However, if you’re able to open the key and use 90+% isopropyl alcohol and a tooth brush to give the board a good clean. A can of compressed air can help dry the components when you’re done. Check the battery with a voltmeter to see if you need to replace it as well.

I’m assuming you have warmed it up and the choke is off at this point? Could be starving for gas or your plug is fouled/dirty/bad. Start looking at those two.

Hello, Some more information would be helpful in this case. Do you have audio coming out of the laptop speakers? Is the volume turned up when the headphones are plugged in/connected? Are your headphones wired or wireless? Do they work with other sources (phone, ipod, etc)? Has the computer updated since you last used them (ie it worked yesterday morning, during a restart the computer updated and now they do not work)? Cheers.