I (and many others) have this issue. Until you find a fix, try this workaround:

1, Open System Preferences.

2. Select "Screensaver" button above.

3. Select "Hot Corners" button.

4. In "Active Screen Corners" drop-down click the blue end of the bar corresponding to the corner of your choice and select "Sleep Display" and click OK.

5. Exit Preferences pane you are in.

Now when you boot to the blue screen just move your pointer to that corner and presto, your display will sleep; the next mouse movement will wake it up to...

a complete desktop display