Help needed

Owing to ill heath for the 12 months I’ve not been able to fly my phantom 3.
But now discovered all 3 batteries and the remote control are all no good and won’t turn on, they all show full charge but nothing happens…
Ideas anyone?
Thanks in advanced

Did you remember to power them on by pressing the power button quickly, releasing it, and then immediately pressing it again for a few seconds?

Yes I did forget.!!!
Many thanks for your reply
Saved me buying new batteries
Long live drone help…