My MacBook Won't Power On

Turn your computer off and disconnect any devices connecting to your computer, including a printer and your mouse. Keep the computer off for several minutes, then try turning it on again.
Check the battery level to your computer. On the side of your MacBook will be a tiny, circle button. Press the button in to test the battery. If all, or a couple, of the tiny lights glow green it does have battery life. However, if one light is blinking it needs to be charged.
Check out your MagSafe port and the battery adapter. Because the MacBook's battery port is magnetic, something could have gotten stuck inside of the port. Make sure the inside of the port is cleaned and cleared of debris. Take a look at the adapter, as well. Make sure the prongs, or pins, are not missing or broken. A broken adapter or dirty port will not be able to charge your MacBook properly.
Restart the computer by pressing Control, Command and the Power Button all at the same time. Hold all three buttons down for three seconds.
Schedule your MacBook for a service appointment with an Apple retailer or electronic/computer specialist if none of the above troubleshooting techniques do not work.
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How to Change Flash Hardware Acceleration in OS X

Open your Web browser and navigate to the “Install Flash Player in 5 Easy Steps” website (see Resources). This page is a resource for Web users looking to download, install, upgrade, and test Flash Player. The page includes a small Flash applet for testing the functionality of your Flash install.
Scroll down to the “Verify if Flash Player is Installed” section. If your Flash Player is working correctly, you’ll see a small Flash Web component with a simple animation. You can disable hardware acceleration only if you have Flash installed and updated.
Open the Flash menu by holding the “Option” button and clicking the Flash Web component. Mac users with a trackpad may be able to open this menu by clicking with two fingers, depending on their trackpad settings. The Flash menu will be the same regardless of which Flash item you use to open it.
Select “Settings” from the list of available menu options. Click the small monitor icon to open the “Display” portion of the Settings menu and un-check the box next to “Enable hardware acceleration.” Click “Close” to save and apply changes. Refresh the Flash test page to see if your playback issues have been resolved.
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