Mac pro not booting up

Help my mac pro will not boot up gray screen with apple logo and the loading icon keeps going round and round but nothing else happening. Iam running Lion OS X (10.7) Help please

hello,
I've a 2.66 MAC PRO, with Tiger OS (10.4.10). I've same problem denounced by clarky99. Everything started a month ago, after some updates:
- plug in manager
- Java
- utility airport
- IDVD
- Airport extreme 2008-002
- security update 2008-007
I've tried the following:
- MAC OS hardware test: no problems
- fresh installation of the OS on an external HD: no change
- PRAM reset: no change
- removal of the physical RAM cards: no change
The only way to avoid the startup and video problems is starting in SAFE MODE (pressing shift key during the boot).
This make me think it's an hardware problem, but I'm not shure.
Next attempts:
- try another video card
- (time consuming) disabling all the processes which are not activated in SAFE MODE, but are started in the normal statup procedure, and then by re-enabling one by one
Any further suggestion is welcome!
kimaluz

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If it was a Mac Pro the thread could and should have been moved to another forum. And you still refer to this as a Mac Pro, not PowerMac. Which leads me to wonder.
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you don't know how to provide more details or what you have tried or are you just lost?
What OS is on it? and this is a 4-drive 65 lb workstation and not a MacBook Pro notebook.
Safe Boot
Lion or ML Recovery Mode
Reset SMC
Kernel Panic
Resolving Kernal Panics
http://www.thexlab.com/faqs/kernelpanics.html
http://reviews.cnet.com/8301-13727_7-10344626-263.html
http://macs.about.com/od/usingyourmac/qt/Troubleshooting-Os-X-Kernel-Panics.htm
http://support.apple.com/kb/TS3742
Mac OS X Help
Isolating Issues in Mac OS
http://support.apple.com/kb/TS1388
https://www.apple.com/support/osx/
https://www.apple.com/support/quickassist/
http://www.apple.com/support/mac101/help/
http://www.apple.com/support/mac101/tour/
Get Help with your Product
http://docs.info.apple.com/article.html?artnum=304725
TimeMachine 101
https://support.apple.com/kb/HT1427
Mac OS X & Mountain Lion Community
https://discussions.apple.com/community/mac_os
https://discussions.apple.com/community/mac_os/os_x_mountain_lion?view=discussio ns
Recovery Mode
http://support.apple.com/kb/HT4718
ExpressLane
https://expresslane.apple.com/
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http://support.apple.com/kb/HT1310
Troubleshooting: My computer won't turn on
https://support.apple.com/kb/TS1367
And just in case....
MacBook Pro
https://discussions.apple.com/community/notebooks/macbook_pro
https://discussions.apple.com/community/mac_os?view=discussions
http://www.apple.com/support/macbookpro

Mac will not boot up, white screen with turning gear for hours on end

mac will not boot up, white screen with turning gear for hours on end

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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b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
c. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. The easiest way to deal with the problem is to boot from an external drive, or else to use either of the techniques in Steps 1b and 1c to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 4
If you use a wireless keyboard, trackpad, or mouse, replace or recharge the batteries. The battery level shown in the Bluetooth menu item may not be accurate.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
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.
Step 7
If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
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.
When you boot in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, your boot volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 6.
If you can boot and log in now, empty the Trash, and then open the Finder Info window on your boot volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then reboot as usual (i.e., not in safe mode.)
If the boot process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
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.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then reboot as usual.
Step 9
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 10
Repeat Step 9, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a Time Machine or other backup.
Step 11
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a boot failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 12
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

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My mac will not boot up - shows a sort of stop sign then grey screen

What Mac, with what version of OS X?

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HelP!

Hello, thanks for taking the time to help me out!
This is a 2008 MacPro (2x2.8 GHz Quad-Core Intel Xeon) running Mountain Lion OSX 10.8.4.
I am running two monitors: a HannsG HH281 and a Hewlett PAckard HP w2408h.
When this first was happening back in March 2013, I thought it had something to do with the ambient light sensor on the HP (the HannG doesnt have a light sensor), but it also might have has something to do with the dynamic contrast on the HannsG. I had shut those features off, and I actually hadn't had this problem in a while and there has been a few Mountain Lion updates since then.
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again. I also just turned the ambient light sensor on for the HP, and again, the problem did not occur.
So it is hard to say if the problem is gone away or not or if it just is not showing itself at the time being?
Here is the graphics card and display info from the System Profiler:
ATI Radeon HD 2600 XT:
Chipset Model:          ATI Radeon HD 2600
Type:          GPU
Bus:          PCIe
Slot:          Slot-1
PCIe Lane Width:          x16
VRAM (Total):          256 MB
Vendor:          ATI (0x1002)
Device ID:          0x9588
Revision ID:          0x0000
ROM Revision:          113-B1480A-252
EFI Driver Version:          01.00.252
Displays:
HH281:
Resolution:          1920 x 1200 @ 60 Hz
Pixel Depth:          32-Bit Color (ARGB8888)
Display Serial Number:          939LK3NA01178
Main Display:          Yes
Mirror:          Off
Online:          Yes
Rotation:          Supported
Television:          Yes
HP w2408:
Resolution:          1920 x 1200 @ 60 Hz
Pixel Depth:          32-Bit Color (ARGB8888)
Display Serial Number:          3CQ8410GZF
Mirror:          Off
Online:          Yes
Rotation:          Supported
Television:          Yes

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Get this error all the time since upgrading to Logic 9.1.4. Thing is, I have a Mac Pro, not a laptop.
Apple sends me to this page:
http://support.apple.com/kb/HT1934
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9.1.4 seems a bit shaky...
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