Completely white/gray screen

When you say "load up screen", I assume you mean the Apple boot screen (it has the apple on a gray background).

You might try resetting the PRAM on the macbook.
You can do this by pressing and holding the Command-Option-P-R keys. You must press this key combination before the gray screen appears.

So, turn the macbook completely off. Turn it on and immediately press and hold the Command-Option-P-R keys until the computer reboots and chimes. Once it chimes, release the keys. Your system should boot normally.

Hi
You can try to zap the parameter Ram (pram). Turn off your Mac, then turn on your Mac and immediately press and hold the Option-Command and the P and R keys. You must press the keys before the gray screen appears. Continue to hold the keys until the computer restarts, and you hear the startup sound a second time.
Hope this helps

Try removing the AC power, removing the battery and then holding down the power button for five seconds. On the MacBook Air, press (left) Shift-Control-Option along with the power button once. Note: You must use the keys on the left side of the MacBook Air keyboard.
If that doesnt work try this:

1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.

Try to reset your SMC (System Management Controller) p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; color: #1a1a18}
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1. If computer is on, turn it off by choosing Shut Down from the Apple menu.

2. Connect power adapter to computer and to a working power source.

3. On built-in keyboard, press (left-side) Shift-Control-Option along with power button just once. Important: Use Shift-Control-Option keys on left side of keyboard.

Note: When the LED on the MagSafe connector is orange/amber, resetting the SMC will change it to green for a few seconds, indicating that SMC was correctly reset.

4. Wait 5 seconds and press power button to start computer.

If it starts without beeping errors reset the PRAM (Parameter RAM)

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1. If computer is on, turn it off by choosing Shut Down from Apple menu.

2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in Step

4. Note: If keyboard does not have an Option key, use Alt key instead.

3. Press power button.

4. Immediately press and hold Command-Option-P-R keys.

Important: You must press this key combination before the gray screen appears.

5. Hold down keys until computer restarts, and you hear startup chime a second time.

6. Release keys.

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If you have your Mac OS X Install disc, insert it into the drive.
Restart the computer and hold down "C" while booting.
Choose your language.
Select "Disk Utility" from the "Utilities" in the menu bar.
Select your Macbook's hard drive in the left sidebar.
Click the "First Aid" tab thats along the top of the viewer window.
Click "Verify Disk" (not verify disk permissions)
If this shows errors click "Repair Disk"
Once completed close the Disk Utility window.
Restart the computer.
If this fails to fix it as well then your next option would most likely be recovering your files from the macbook either by booting into target disk mode (hold down T at startup) and transferring them via a firewire cable, or removing the hard drive and hooking it up to another Mac to get the files. Then do a clean install of Mac OS X using your installation discs.

Make sure the MagSafe adapter is securely attached to the Macbook and free of debris.

There are two procedures that are advised by Apple to assist in resolving issues where the Macbook chimes at start up, but displays no video.

Here is the first procedure:
Here are some steps you can try to resolve the issue:

• First, hold in your power button for approximately 10 seconds to do a hard shutdown, if you have not already turned your Mac off.

• Once your Mac is shutdown, you will need to perform what is called a PRAM reset (Parameter RAM)

• Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously .

• Turn on the computer.
• Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.

• Now, hold the keys down until the computer restarts and you hear the startup sound for the third time.

• Release the keys and allow the Macbook to start up.

Observe to see if your Macbook will boot to the Desk top normally. If it does not, here is the second procedure:
-------------------------------------------------------------------
-SMC RESET-
The System Management Controller is an integrated circuit (computer chip) that is usually on the logic board of your Mac computer.

It is responsible for power management of the computer. It controls backlighting, hard disk spin down, sleep and wake, some charging aspects, trackpad control, and some input/output as it relates to the computer sleeping.

• If the computer is on, turn it off.
• Disconnect the AC adapter and remove the computer's battery.
• Press and hold the power button for 5 seconds
and then release the button.
• Reconnect the battery and AC Adapter.
• Press the power button to restart the computer

Update me if you require further assistance.

Regards,

-Mactechtrainer

Because this could go in the way of a hardware issue or be an issue with the types of DVDs you are using (even legal and commercial copies), so I have three procedures below, I would suggest you try, in order to resolve your Macbook issue with auto-ejecting DVDs.

Procedure #1
-PRAM RESET-
The Parameter RAM Reset is a good troubleshooting process for working with various functions including refresh rate, screen resolutions, and DVD region issues to name a few.

Steps:
• First, shut your Macbook down properly
• Once your Mac is shutdown, locate the following keys on the keyboard:
Command, Option, P, and R.

You will need to hold those keys down simultaneously .

• Now turn on the Macbook.
• Press and hold the Command-Option-P-R keys.

• You must press this key combination before the gray screen appears.

• Now, hold the keys down until the computer restarts and you hear the start up sound for the third time.
• Release the keys and allow the Macbook to start up.
Run the next procedure (below) from within your Mac OS X Desktop.
------------------------------------------------------------------------
font.f1 {font: 13.0px Myriad Pro} Procedure # 2

-RUN DISK UTILITY -

Go to Finder Menu bar
• Click Go > Utilities > Disk Utility and open up Disk Utility app.
• Click on Macintosh HD volume (or on the name you have changed this volume to.)
• Select "Repair Disk Permissions"
**Let Disk Utility run this repair permissions until completion

Once Disk Utility is complete and there are no errors in red in the completion summary, quit Disk Utility.

Proceed to the last procedure.
------------------------------------------------------------------------
Procedure #3:
Check this Apple support page for Macbooks and make sure your Macbook is update on its firmware and SMC updates:
Apple Macbook Support page
------------------------------------------------------------------
•Now try a few types of DVDs, commercial, burned and blank DVDs and if you have different brands of blank DVDs make sure to try them as well.
------------------------------------------------------------------------
Apple has done it best, by providing a great support page, that I would like to provide you as a final troubleshooting support option:

Apple Support Link:
Troubleshooting the slot load optical disc drive
You have your work cut out for you, but not to worry, follow these procedures listed in this post and in the links I have provided and you will have an answer as to if the issue with the DVDs auto-eject from your Macbook, is a hardware, software or DVD disc issue.

Regards,

-Mactechtrainer

Try this procedure with the Macbook Air SuperDrive
and then click the Apple link below to follow the remaining recommended steps with for troubleshooting your Macbook Air SuperDrive.

Here are some steps you can try to resolve the issue:
• Make sure your SuperDrive is connected to your portable.

• Properly shut down your Macbook Air

• Once it is is shutdown, you will need to perform what is called a PRAM reset (Parameter RAM)

• Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously .

• Turn on the computer.
• Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.

• Now, hold the keys down until the computer restarts and you hear the start up sound for the third time.

• Release the keys and allow the Macbook to start up.

--------------------------------------------------------------
Apple Support Link:
Troubleshooting the MacBook Air SuperDrive

This process is supported by Apple, but if it does not work, just let me know.

Regards,

-Terry

You can try to reset the NVRAM and PRAM, see if that will work.

Resetting PRAM and NVRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
best of luck

your hard drive has most likely crashed.  this happened to my buddies macbook and it was $300 for a new hard drive, hopefully you still have a warranty on your mac, that way apple will cover the price.  take it in to apple and have them diagnose the problem.  my buddy was lucky bc apple covered the cost, if they refuse just be pushy and theyll eventually do it for you, im sorry