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First, please hold down the Power button for atleast 20 seconds (continue holding even when the screen switches off), and then release the button.
Next, press the Refresh (circled arrow) and the Power buttons together on your keyboard; does it turn on all right this time?
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Sorry about the delay in getting back to you; I had gone off for the day when you replied back to me.
Please check out the following image now:
You need to press both of these keys together when powering your Chromebook back on; does it still show up a blank screen this way?
Keep me posted.
Hmm, let me open up your question to our other experts now, who can assist you further with this issue. Please do NOT rate until your issue has been resolved (or you will be charged.) Thank you.