My Mac Pro Stucks at Apple logo while starting up.

Hi.I have had my MacPro for a year.when i turn it on, it stucks on apple logo and nothing else.if you can solve my problem help me please.

what i am saying is when i just press the power button the Apple logo comes up.while happening this,a load strip shows on the bottom of apple logo.it loads something on the same place for couple seconds and still the same.the gray circle line load indicator which is usual to see while turning on shows up too.the operating system does not start up at all and stuck on Apple logo.couple nights ago, i was testing a wrong article about hardwares and i did not know that the article was wrong.i turned of and on the system 4 or 5 times in a row.the sixth time i turned it on the operating system started up but the finder was not getting open.i waited a long time to see if it is gonna solve the problem by itself but it did not.the seventh time i turned it on as a restart the issue i described happens which is stucking on Apple logo.the is a CD in the disk driver also.that was the whole things about the problem.so sorry for annoying you and appreciate your help.

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Kreis wrote:
Any chance this can be resolved without reinstalling OS X?
Without erasing and installing yes.
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Hello,
I have a MAC PRO 2008, and it boots without a grey screen and apple logo.
If I turn on de mac the screen does not go on, after a 10 a 15 seconds the OS is starting up, screen pops on and have no isseus with the MAC pro.
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Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since your last backup, you can skip this step.
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Step 2
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
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Boot in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
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Step 4
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 5
Launch Disk Utility in Recovery mode (see Step 1.) Select your startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
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Reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 7
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A dead logic-board battery in a Mac Pro can cause a gray screen at boot. Typically the boot failure will be preceded by loss of the startup disk and system clock settings. See the user manual for replacement instructions.
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Have you reinstalled Snow Leopard? Before doing that see the following:
Kappy's Personal Suggestions for OS X Maintenance
For disk repairs use Disk Utility. For situations DU cannot handle the best third-party utilities are: Disk Warrior; DW only fixes problems with the disk directory, but most disk problems are caused by directory corruption; Disk Warrior 4.x is now Intel Mac compatible. TechTool Pro provides additional repair options including file repair and recovery, system diagnostics, and disk defragmentation. TechTool Pro 4.5.1 or higher are Intel Mac compatible; Drive Genius is similar to TechTool Pro in terms of the various repair services provided. Versions 1.5.1 or later are Intel Mac compatible.
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Get an external Firewire drive at least equal in size to the internal hard drive and make (and maintain) a bootable clone/backup. You can make a bootable clone using the Restore option of Disk Utility. You can also make and maintain clones with good backup software. My personal recommendations are (order is not significant):
Backuplist
Carbon Copy Cloner
Data Backup
Deja Vu
iBackup
JaBack
Silver Keeper
MimMac
Retrospect
Super Flexible File Synchronizer
SuperDuper!
Synchronize Pro! X
SyncTwoFolders
Synk Pro
Synk Standard
Tri-Backup
Visit The XLab FAQs and read the FAQs on maintenance, optimization, virus protection, and backup and restore.
Additional suggestions will be found in Mac Maintenance Quick Assist.
Referenced software can be found at CNet Downloads or MacUpdate.
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Open Activity Monitor in the Utilities folder. Select All Processes from the Processes dropdown menu. Click twice on the CPU% column header to display in descending order. If you find a process using a large amount of CPU time, then select the process and click on the Quit icon in the toolbar. Click on the Force Quit button to kill the process. See if that helps. Be sure to note the name of the runaway process so you can track down the cause of the problem.
And, visit The XLab FAQs and read the FAQ on resolving SBBOD issues.
Yours may simply be an issue of cleaning up. You can try creating a new user account. Log into the new account. Do all these problems disappear?
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My Mac Pro Stucks at Apple logo while starting up.

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