Hey, this is easy.
Just get a relay, one big enough to run your gear and has at least three sets of normally-open contacts. And a pushbutton and some outlets.
Power your gear through two sets of contacts and connect the third set across the pushbutton. Place everything neatly inside an appropriately-sized enclosure like DIY guys use.
Plug it up.
When you push the button the relay closes and powers up the outlets to your gear. When you let go of the button everything stays connected because that third set of contacts is across the button and they're closed too.
When the power goes out the relay drops out. You may push the button again whenever you want after the power is back and you've turned all the equipment off.
Just get a relay, one big enough to run your gear and has at least three sets of normally-open contacts. And a pushbutton and some outlets.
Power your gear through two sets of contacts and connect the third set across the pushbutton. Place everything neatly inside an appropriately-sized enclosure like DIY guys use.
Plug it up.
When you push the button the relay closes and powers up the outlets to your gear. When you let go of the button everything stays connected because that third set of contacts is across the button and they're closed too.
When the power goes out the relay drops out. You may push the button again whenever you want after the power is back and you've turned all the equipment off.