When my mac book pro starts up and shows the apple sign that apple sign turns into a restricted sign(circle with a line through it) and then to a blank screen, i need to fix it!

Remove the RAM chips and re-insert. Now try.
Go to System Preferences, Accounts, click on your user account, then click on login items and select all the choices, and then click on the - icon box. Now try this thing out. Nothing still? Shut the thing down and wait 5 seconds. Now remove your battery and make sure your AC adapter is not plugged in. Now press and hold the power button for 5 seconds. Now put back in your battery and plug back in the AC adapter and power this beast up. Any luck? No? Power down and wait 5 seconds. Now press the power button and immediately press the apple logo key-option key which is next to the apple logo key-the P key- and the R key at the same time. Wait for 3 bong sounds and then you can release the keys. Still nothing? Your fu.kd bud, because you got an expensive paper weight. You gonna have to repair or replace the logic board.