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my mac won’t boot only sound and with a white screen and no apple logo what can i do??

Try booting from an external drive and let us know your results.

There are some steps to repair white screen on MAC

  1. Try a Safe Boot Mac OS X 10.2 and later Safe Boot includes disk checking and repair. First start your Mac in Safe Mode. To do this, shut down your Mac. Now Turn on your computer by pressing the power key while holding down the Shift key. When you see the Apple logo, release the Shift key. After your Mac fully starts, restart your computer normally without holding any keys/buttons during startup. Note that Safe Boot is slower to boot.
  2. Run Disk Utility Turn your Mac off by holding down the power button for a few seconds. Turn on your Mac and hold down the Command and R keys until you see the Apple logo. Then you should see a “Mac OS X Utilities” window. Select Disk Utility, click your OS X hard drive and select verify/repair disk.
  3. Reset PRAM This may fix your boot failure. PRAM (“parameter random-access memory”) stores some of your settings. You may reset PRAM. To do that, turn off your Mac. Now turn on your Mac. Then, immediately, hold down the Option-Command-P-R keys until your Mac restarts. When your Mac is starting up, release the keys.
  4. Using Terminal in Single User mode Most times, the steps above will usually fix your problem. However if it did not work for you there are a few additional steps that you can take before you decide to Reinstall Mac OS X on your machine. The first three steps help you launch into the single user mode on your Mac. Step – A. Shut down your Mac. Step – B. Press the power button to start up your Mac. Step – C. Immediately Hold down Command-S for single-user mode. Now you have launched your Mac on a Single user mode. The next few steps will help check for file system consistency and remount the boot volume. Step – D. On the terminal window Type fsck –fy and press return Step – E. Type mount –uw and press return Step – F. Type touch /private/var/db/.AppleSetupDone and press return Step – G. Type exit and press return These Seven steps above should help your Mac deal with the White Screen issue.
  5. Reinstall Mac OS X If nothing above works, you may try this. Your Mac needs to be connected to the Internet. See number#2 above. Follow the same steps. Restart your Mac and hold down the Command key and the R key until the Apple icon appears; when you see the Mac OS X utilities window, select the Reinstall option.

First, try an SMC and NVRAM reset (Google to find out how). Was it dropped/knocked to cause this to happen? Has it suffered liquid damage?

i will suggest try doing a reset . just hold the power key for 1 min and restart the computer and see if this works for you .

I have same problem have a friend who brought me a 2010 MacBook Pro thought can’t boot , when going to safe mode or recovery mode when goes to boot get white screen , does same thing even with a new hard drive have tried clearing nvram , and all other troubleshooting can anyone else know what my be causing this issue ?

This issue started last night, I followed all the above steps, but nothing work with me, I connect my Mac to my tv and was able to see my files and transfer them to external driver, now that means the screen is damaged or it’s loose some where inside, the hinges are ok? Please advise