That depends ....
Who's playing?
Is one of them broken?
Are both of them broken?
Is one or both of them hypothetical?
What do you mean by "work"?
Are you trying to use them as a studio monitor?
Are you trying to use one or the other as a mic preamp?
Do you have available the appropriate mains voltage from a properly-wired grounded receptacle?
What is the ground reference?
Where is the actual ground? Are you under it? Far above it?
What's the temperature? Humidity? Ambient air pressure? Is the air standing still or moving very quickly in various directions at once? Have you been picked up by a tornado?