Stop sign when turning on macbook pro

My macbook pro was running very slowly, sometimes not loading web pages and always crashing, I decided to upgrade to Yosemite, it made it worse for a few hours but then suddenly my macbook was running quickly and normally, I thought it was fixed. Today I kept getting the rainbow pinwheel, every few seconds, I had to restart my macbook several times (this took ages as there is a loading bar when I entered my password) but now I am just getting a weird grey stop sign and I am unable to sign in or even get on my macbook. I should also note that the fan was very loud these past few days, now I can't hear it at all.
I have only had this macbook for about 9 months and don't have the money to get a new one, is there anyway to fix it at home, or will I have to take it into a store?

What model MacBook Pro? Could be that the HD failed. The stop sign means that a boot drive could not be found
Try safe mode
OS X: What is Safe Boot, Safe Mode?
Try resetting the SMC and NVRAM/PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM
Boot to Recovery and try repairing the HD
OS X: About OS X Recovery
Last reinstall Yosemite.
OS X Yosemite: Reinstall OS X
If still problem that indicates a failed HD

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HT1338 When turning on Macbook pro laptop I receive a blank screen for a few seconds, then a folder with a ? is displayed and remains as if the computer is now Frozen. Mac book Pro leopard operating system. What can I do to get past the freeze?

When turning on Macbook pro laptop I receive a blank screen for a few seconds, then a folder with a ? is displayed and remains as if the computer is now Frozen. Mac book Pro leopard operating system. What can I do to get past the freeze?

Could the disk have failed?
Can you hear it?
Boot from the install DVD and see what Disk Utility says.

Hi, I turned my macbook pro off before I went to sleep, and this morning when I awaken. I can't seem to use the volume at all! I went to system preferences sound output BUT everything is light grey and it some-how looks like I don't have permission.

Hi, I turned my MacBook Pro off before I went to sleep, and this morning when I awaken. I can't seem to turn up or down my volume. It comes up with all the volume bars and a little circle sign with a diagonal line in the middle, like a stop sign. I have gone to system preferences > Volume > Output BUT all my volume preferences have gone all light grey and wont let me access them.
Anyone help?

Hi EmalooneyToons,
Welcome to Apple Support Communities!
Take a look at the article linked below, it provides some suggestions for troubleshooting audio issues on Macs and when to setup service for your device, if needed.
Troubleshooting issues with no audio from built-in speakers on Macs
http://support.apple.com/kb/ts1574
-Jason

When i turn my macbook pro on I get a green apple then just a white screen

When I turn my macbook pro on I get a green and white lined apple then just a white screen anyone help please ?

Hey there Petecaswell,
It sounds like you are seeing a green Apple logo, and then a white screen before the computer boots to your user. I would start by updating your computer:
OS X: Updating OS X and Mac App Store apps
http://support.apple.com/kb/HT1338
Then if the issue persists, I would perform a PRAM reset:
OS X Mavericks: Reset your computer’s PRAM
http://support.apple.com/kb/PH14222
Shut down your Mac.
Locate the following keys on the keyboard: Option, Command (⌘), P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on your Mac.
Immediately press and hold the Option-Command-P-R keys. You must press this key combination before the gray screen appears.Continue holding the keys down until your Mac restarts, and you hear the startup sound for the second time.
Release the keys.
Resetting PRAM may change some system settings and preferences. Use System Preferences to restore your settings.
Thank you for using Apple Support Communities.
All the best,
Sterling

When I try to turn on Macbook Pro nothing happens/think I crashed it.

When I try to turn on Macbook Pro nothing happens/think I crashed it.

Try command R on start up to get into recovery. Is that doable.
option command R internet recover. http://support.apple.com/kb/ht4718
Genius reservation http://www.apple.com/retail/geniusbar/
on-line https://getsupport.apple.com/GetproductgroupList.action
check warranty https://selfsolve.apple.com/agreementWarrantyDynamic.do

When i turn my macbook pro on , the apple logo shows up, but it is just loading. I have tried to turn if off , but the same problem appears. Someone know what the problem is?

when i turn my macbook pro on , the apple logo shows up, but it is just loading. I have tried to turn if off , but the same problem appears. Someone know what the problem is?

Boot into Safe Mode
A Safe Mode boot can take a few minutes compared to a normal boot.
Once you are in Safe Mode open System Preferences > Accounts > Login Items
If you have anything listed there to launch when you startup your Mac, delete all items.
Then go to the Apple menu / Restart.
You can also use Safe Mode to do a "live verification" of the startup disk in case it needs repairing.
Help here > Using Disk Utility to verify or repair disks

Whenever I turn my MacBook pro on, all the other stuff is loaded (MS word/excel/powerpoint), Spotify, iCal, etc are automatically loaded, so in order for me to go to my desired website, I have to close (x) out all applications loaded. Please advise.

Whenever I turn my MacBook pro on, all the other stuff is loaded (MS word/excel/powerpoint), Spotify, iCal, etc are automatically loaded, so in order for me to go to my desired website, I have to close (x) out all applications loaded. Please advise.

If you are using Lion:
Dealing With The Resume Feature of Lion
Managing Mac OS X Lion's application resume feature.
If you shutdown your computer you should get a dialog asking if you want applications to resume on the next startup. Simply uncheck the box to prevent that from occurring. Open General preferences and uncheck the option to Restore windows when quitting and re-opening apps. You can also install a third-party utility to control resume features on individual applications: RestoreMeNot or Application State Cleaner.
It is possible to completely stop the Resume feature although I'm unconvinced that it is that annoying. Nevertheless see the following:
If you have not yet done so you must first make your /Home/Library/ folder visible. Open the Terminal application in the Utilities folder. At the prompt paste the following command line:
chflags nohidden ~/Library
Press RETURN. Quit the Terminal application.
In the Finder navigate to the /Home/Library/Saved Application State/ folder. Delete the contents of the folder. Back up to the /Home/Library/ folder. Select the Saved Application State folder. Press COMMAND-I to open the Get Info window. In the Sharing and Permissions panel at the bottom click on the lock icon and authenticate. Set each of the listed entries to Read Only. Close the Get Info window.
Quit all open programs except the Finder (this is very important.) Next, navigate to the /Home/Library/Preferences/ByHost/ folder. Look for a .plist file with "com.apple.loginwindow." in the file name followed by some numbers in hexadecimal. Select the file. Press COMMAND-I to open the Get Info window and in the Sharing and Permissions panel click on the lock icon and authenticate. Set each of the listed entries to Read Only. Close the Get Info window. If you also find a file with the same filename but with a last extension of ".lockfile," then you should delete it.
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I installed bootcamp but became a pain to use so I unistalled it. Now every time I turn my Macbook pro on it keeps asking me what startup disk to use. I tried using the system preferences to correct this but it hasn't worked. Can someone help

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Delete the System Preference .plist file (preference file) and when rebooting and #2 Reset the PRAM
Deleting the System Preference or other .plist file
..Step by Step to fix your Mac
Then head to System Preferences > Startup Disk and select the OS X volume to boot from.

How do I stop the indexing on my MacBook Pro? It's been indexing for 2 days.

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Step 1
These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Triple-click anywhere in the line below on this page to select it:
syslog -F '$Time $Message' -k Sender mdworker -o -k Message Rne Norm -k Sender mds | tail | pbcopy
Copy the selected text to the Clipboard by pressing the key combination command-C.
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☞ Open LaunchPad and start typing the name.
Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
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The Terminal window doesn't show the output. Please don't copy anything from there.
If any personal information appears in the output, anonymize before posting, but don’t remove the context.
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mdutil -as 2>&- | pbcopy
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Eject your hard drive.
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Use Windows to copy your files over to the hard drive.
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Just remember that Windows has to be running first, before you plug in your hard drive.

Stop battery charging with plugged MacBook Pro

Hi,
is it possible to stop battery charging on a MacBook (Pro) with the power plug connected? I have looked into the PM api docs but cannot find anything to do that.
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Thanks,
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Hi,
is it possible to stop battery charging on a MacBook (Pro) with the power plug connected? I have looked into the PM api docs but cannot find anything to do that.
The idea is to make a menu app to toggle between "Preserve Battery Life" and "Full Power" modes. According to http://www.batteryuniversity.com/parttwo-34.htm, Li-Ion batteries loose less capacity over time when charge level is about 40% of max. capacity, escpecially with the comparatively higher temperatures that are given in a running notebook.
So the "Preserve Battery Life" mode would charge to say 50%, then let the MB run on battery to about 30%, then charge again etc. Before taking it on the road, one would switch to "Full Power" mode to charge the battery to 100%.
Thanks,
Bastian

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Stop sign when turning on macbook pro

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