I dropped my Macbook Pro and now the screen stays on the black apple with the gear. Is this fixable?

SOURCE: My Macbook Pro wont boot - stays on the blue screen

The fact that the "BONG" sound (or better known as the MAC CHIME) does come on and nothing further means that the computer cannot find your hard drive or (sometimes worse) cannot find the operating system. This means that you will have to remove the hard drive... then insert it nice and firmly again. Try now to boot. If nothing happens then your drive has gone faulty and it could mean that you may have lost your data... NOT NECESSARILY though.... What I mean by that is that you may still be able to access the dat when you connect the "faulty" drive to another computer via USB with an external casing and then get your DATA off it.

SOURCE: My macbook pro makes the startup noise then just stays black

There's a magnetic reed switch in there, to the right of the mousepad. It's activated by a magnet in the screen, so when you close the lid the reed switch closes its circuit and the machine goes into standby. It's common for it to fail. To get your machine to start up again you'll have to remove the problem: open up the case and find that switch. Unplug and remove it and you'll find your problem is solved, although you will of course need to put it to sleep from the Apple menu from then on - it won't do it automatically any more. You can get replacement reed switches but they're not cheap.

Hope that helps!
Matt

SOURCE: Our MacBook doesn't do anything but stay on a

You got the rainbow spinning wheel of death, which means take out the RAM chips and re-insert. Now try. Nothing? Replace the RAM chips with RAM chips you know are working. Now try-Nothing? Install disc one of the install disc Apple gives you and go into the system utilities and repair disc permissions and also click on repair disc after that. Now try-Nothing? Replace the hard drive and re-install the OS. Now try-Nothing? Your fu.kd my friend, which means you got a logic board problem.

SOURCE: apple macbook pro 3.06ghz 8gb 1067 ddr3 memory

It sounds like your imac really requires a tuneup. You can do this using an application which can be downloaded for free from http://www.macupdate.com/app/mac/11582/onyx select the version for your OS e.g. Snow Leopard, Lion etc. It is worth backing up up your machine first before running it. Start it up and it will first check the smart status of your hard drive then it will verify the startup volume (this can take a minute or so) click on the automation tab after reading the warning page. check under maintenance (repairs permissions and execute maintenance scripts) under rebuilding click on LaunchServices and Display of Folders' contents, under cleaning check all the boxes. And then click on execute. As it says this will take some time, possibly up to an hour, don't worry it will be worth it in the end. Once it is finished it will come up with restart or shutdown, press restart. Hope this helps.