Garmin 705 problems

I put my Garmin on charge before going away for a long weekend. Today I've gone to use it and it won't power on. Anyone else experienced anything like this with Garmin? I'm hoping it's just fried the battery and nothing more serious.
I ride a bike. Doesn't make me green or a tree hugger. I drive a car too.
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hold down the mode button, then press the on button, keep holding down the mode button, give it 30 seconds, if it wakes up, release the mode button, when prompted choose "yes" to clear data
Settings --> System --> About Edge.