Macbook internal battery frozen - how to reset?

Hi all,
I have here a late model macbook with an internal battery - it seems to have frozen on startup, the screen is just white. I've tried holding the power button down for 10 seconds, but it doesn't reset. Even if I close the screen, the backlight for the display remains lit. I'm sort of stuck trying to figure out how to reset this thing, in normal cases I would remove the battery but obviously its not possible in this case.
If anyone can advise where to go from here it would be appreciated. Otherwise I'm guessing I just need to leave it to one side until the battery finally drains.
Thanks
Sam

Hi Dave, thanks for your reply.
The problem is that I can't get to the initial boot phase to reset the SMC, as the macbook had frozen with a white screen after starting - i.e. it was running and I had no way of rebooting it (as mentioned, holding down the power button had no effect). I left it at the office overnight so the battery should be well and truly drained by now, I'm hoping I'll be able to plug in the power and reset the SMC as you suggest.

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