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Please try the following:
Press and hold the power button down for 3 seconds. Release it before the 4-second shutdown override.
If you are able to see a screen like the one below then you can normal boot.
If boot normal does not work try a BIOS recovery; please download the latest BIOS version for this unit at:
Please follow the steps to do a BIOS recovery at the following link:
If that works try to access windows now