Mac osx wont boot up

I turned on my laptop this morning but the mac osx load bar goes about half way and turns into a blue blank screen. I can't do anything except restart. I tried 3 times and the same thing happens.
Any help would be great because i have a book due. Thanks.

I have a similar problem when I tried to boot up my PowerBook G4. When I Startup or Restart the Powerbook, sometimes I hear the hard drive spinning but I don't hear any chime sound and nothing happens on the screen. I tried many different ways(command-control-power) to start my computer but sometimes no success. Then all of sudden I hear the Chime and it works. after that everything works fine.
I am afraid to Shut down or Restart my computer.
I want to startup my computer with Install CD (or DVD) but whenever I tried that, I have more diificult time booting the PowerBook. I hear Hard Drive spinning and CD spinning but nothing happens after that.
Can anyone knows what is causing this problem and how can I trouble shoot this issue?
Thank you.
Powerbook G4 Mac OS X (10.4.4)

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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
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http://www.thexlab.com/faqs/kernelpanics.html
http://reviews.cnet.com/8301-13727_7-10344626-263.html
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http://support.apple.com/kb/TS3742
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http://support.apple.com/kb/TS1388
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https://www.apple.com/support/quickassist/
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http://docs.info.apple.com/article.html?artnum=304725
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My 2010 Unibody Mac Mini wont boot from disk, i need to open disk utility to repair my drive but it wont boot, any ideas?

it started yesterday, and nope, not changed anything apart from the apple update for S.L. a week or two ago, and its stuck at the spinning gear, this has never happened before

Osx wont boot after installing windows dev preview.

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mcwilliamsc wrote:
Do i need to make a clone or will my time machine backup work.
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I only have one external drive andni dont think a clone will fit.
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mcwilliamsc wrote:
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http://eggfreckles.net/notes/burning-a-lion-boot-disc/
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I have a problem where for some reason when I start up my Macbook Pro (intel core duo) it does not detect the internal hard disk drive at all. I have run a hardware test and it shows no problems whatsoever. I have tried resetting the PRAM etc and to no avail. Yesterday the system hung and I tried to force quit and it wouldn't do anything so eventually I held down the power key and when it tried to reboot this is the problem I was faced with (it would boot up with the "no entry" sign). I accepted complete defeat and went to completely re-install OSX however it doesn't even show the internal hard drive when I wait for it to give me install destinations. I had tried seeing the hard drive through disk utility however it only shows the install DVD and that's it in the sidebar. I resigned myself further to thinking either the logic board or the HDD had packed in all and I took it round to my brother in law to see if there is anything he could do without opening the machine (he is Oxford educated and writes programmes etc so is very knowledgable), now this is the part that has miffed us both, he started it up using a Linux disc and once running, Linux see's the hard drive with no problems. He has been able to access the HDD with absolutely no problems under Linux both reading and writing to it. I even took my Mac Mini round and he booted them both up in Linux and completely copied Mac OSX from the mini to the macbook pro but still when I try booting up its as if the HDD isn't even there. Why can Linux see the drive and not Mac OSX? Please don't be affraid to get very technical in your answers as they may mean nothing to me but will probably all make sense to my brother in Law. Any sugestions at all would be greatly accepted.

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Hi,
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Welcome to Apple Discussions!
You picked 10.4.1 in your profile.
Intel Mac Minis at minimum came with 10.4.4.
If it came with a 10.5 genuine DVD, it most certainly was not running 10.4.1 or 10.4.4. Perhaps you mistook one Mac Mini install DVD for another? Does your Mac Mini have 4 USB ports on back? What does the 10.5 installer disc you used look like?

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In the future ignore the computer's requests to update unless you are backed up first. This is a good lesson to learn. I would get an external Firewire hard drive and Prosoft Data Rescue and attempt to recover your data. If that doesn't work, you can try to repair your directory with Disk Utility from your restore disk as my FAQ explains:
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Hi, I turned on my imac g4 15" 700mhz today to find that it wont boot osx at all!
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Not to get off the subject of the original post too much, but:
James,
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Remove the drive, mount in another computer (you mentioned that you tried to firewire it to another G4). Instead, actually remove the drive from your machine and install in the other G4. Boot the other G4. Hopefully the drive will mount as a secondary drive. If so, back up your data. If not, run Disk Utility "Repair Disk" on it. You may have to run a third party app like Tech Tool Pro or Disk Warrior. Doing that should fix the drive enough for you to get the data off.
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Sorry I dont know which part of the folder you mean!!
In my Macromedia folder thereare the following subfolders: Flash Player, Security, Shared Objects, macromedia.com (underneath which s listed 'version .txt', www.macromedia.com (which contains a further sub-folder 'bin' and fpupdatepl.
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Sounds like you have a PowerBook, not a desktop machine. You've landed in the PowerMac G4 forums for late-model desktop machines like the picture under my name at the left. The G4 PowerBooks have separate forum areas, broken down by model and screen size. Find your specific version and follow one of these links:
G4 PowerBook Titanium case 15-inch
G4 PowerBook Aluminum case 12-inch
G4 PowerBook Aluminum case 15-inch
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Welcome to Apple Discussions.
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When I type mac-boot in the firmware it says "not enough memory".
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Power Mac G5 wont boot.

Hey everyone!
This is my first time posting here, but I get all my technical problems solved here, so thank you to everyone!
Anyway, getting on to my problem (which I cannot find a answer to)
My Power Mac decided the other day it wasnt going to boot up. All that would happen when I pressed the power button would be the red light (on the logic board) would flash while I can the button pressed it, I would hear 2 clicks like a relay, and that was it. Nothing, it would never boot.
So I switched the computer off at the wall, left it for 2/3 minutes, and all was fine, would boot and restart. But, if I shut down the computer, I would not be able to get it to turn back on, unless I switched it off at the wall again.
I do know that turning it off at the wall resets the SMU? So would there be a problem with my SMU or something? No idea if that is even possible!!
Can anyone shed some light on the problem? Just to let you know the computer was never droppped/banged/hit etc etc. I was on it, turn it off to pop out for a hour, came back and its been like that ever since
Any help will be much appriciated!
James

Hi James, and a warm welcome to the forums!
Not sure which Mac it is you have with the l essuseful new forums, but it sounds like the classic case of either a bad/low,/dead PRAM battery, or a leaking Capacitor.
Might be time to replace the PRAM Battery, 4 years is close to their lifespan, far less if ever without AC power, & if weak can cause really strange problems...
See which one your Mac has...
http://eshop.macsales.com/item/Newer%20Technology/CR2032/
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/

Mac osx wont boot up

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