Old Power Mac G3 won't connect to monitor

Before I consign it to the recycling depot I need to retrieve some files from my old G3, which I've rarely turned on for years. Problem is, it won't connect to the Sony monitor - no signal. The G3  makes all the right noises, as does the monitor, but then I just get the 'no signal' message on the monitor. Checked the input setting and the connections and can't find a problem. Worked perfectly last time I started it up about a year ago.
Any suggestions as to what the problem might be or an alternative method of seeing/accessing files on the G3 gratefully received!

Hi Ulessa,
Is this a Beige G3:
  or 
or a "Blue & White" G3:
Although released very close to each other in time, they are quite different and need different troubleshooting. Example: The Beige G3 may give no video at startup if the internal backup battery (or "PRAM" battery) is dead; the B&W is not as dramatic when faced with a dead battery.

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