Only thing FAs can do is turn off/on the switch to see if it works...otherwise, nothing FAs can do in the air.

Generally, powerports are always on. There may be instances it was turned off prior to boarding by a previous cabin crew, flight deck crew, maintenance, or plane was sitting overnight with all power turned completely off.

Some powerports feature a green indicator light that illuminates when power is available. AC powerports also feature red indicator lights that illuminate when powerport is not operating correctly. If a red light appears and there is an item plugged in to the outlet, try removing and reinserting the plug. If nothing is plugged in, or the red light remains illuminated, report it to the FA so they can inform the pilots to write it up for maintenance to check it out.

Often times, only one device is allowed per outlet, splitter or power adapter cords may not be used. Often times, when too much power is being drawn to the powerport, it will shut off so it won't create overheating/fire. Powerports are NOT to be used to recharge batteries; however, electronic devices containing batteries may be plugged in, as long as the device is switched on.

If you suspect a powerport is inoperable, try unplugging the device for a couple of minutes, then plugging it back in. This MAY resolve the issue, particularly if the device was plugged in before the powerport system was turned on (if it had been off for whatever reason)

**added**

just saw this interesting article on Lithium batteries too, so this is another thing to keep in the back of your mind with all our electronics we have now.

Lithium Battery Fires

Hope this helps a little