Grey Screen on Start up and Hard disk not working

Hi , I was working and suddenly some popping noises came out of the hard drive. I tried to save my work but i couldn't because it got "stuck". I had to turn it off and when I restarted a grey screen appeared without the apple logo. It won't start up and starting from cd, safe mode, single user mode don't work. I reset the PRAM too and nothing works. I'm worried about recovering the data... what should I do? I have work there that i need!!!
thanks

thanks for your reply. I took my powerbook to 2 apple authorized technical service and both of them told me that they couldn't get the data using disk warrior.
I already removed the hard drive and replace it with a new one. However I still want to recover data. I plug the hard drive to my home powermac with a usb connector and using disk utility and terminal i was able to "see" the drive but not mount it. In disk utility the drive appears as 0 bytes.
I want to try using Terminal or Single user mode to mount the hard drive, and/or repair it and try to recover some important files that I urgently need. Do you know how?

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Boot to the Recovery HD:
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Thank you for that update.
I would next backup your device to iTunes with this article:
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http://support.apple.com/kb/HT1766
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http://support.apple.com/kb/ht1414
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Take care,
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mr.edsr wrote:
Where is the SMC located and how is this done? Thank you!
Please read this link:
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http://support.apple.com/kb/HT1661
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/sbin/fsck -fy
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Best regards
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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I forgot to add that afterawhile the hard disk isnt recognizable again and i have to reset it to get it working
Message Edited by jellydish on 02-13-2009 06:09 AM

The same thing is happening to me... After the HDD goes to sleep, when you goto access it again you can hear it spin up but you still can't access it at all.

Long wait on Startup and Hard Disk not found

Hi. I don't know if these problems are related to each other, but they both showed up at the same time. I upgraded to Mountain Lion recently, and these appeared after that.
I'm getting a long wait on startup (before I can select my username), which seems to be related to this timeout in system.log
Aug 16 13:26:29 point configd[18]: InterfaceNamer: timed out waiting for IOKit to quiesce
Aug 16 13:26:29 point configd[18]: Busy services :
Aug 16 13:26:29 point configd[18]:   MacPro3,1 [1, 80583 ms]
Aug 16 13:26:29 point configd[18]:   MacPro3,1/AppleACPIPlatformExpert [1, 80461 ms]
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Aug 16 13:26:29 point configd[18]:   MacPro3,1/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI [1, 80427 ms]
Aug 16 13:26:29 point configd[18]:   MacPro3,1/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/SATA@1F,2 [1, 80349 ms]
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Hi,
Follow the steps listed in the below link
http://h30434.www3.hp.com/t5/Notebook-Operating-Systems-and-Software/quot-Hard-Disk-3F0-BootDevice-n...
"I work for HP."
Please click the "White Kudos" star to say thanks for helping.
Please mark "Accept As Solution" if my help has solved your problem.

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How is the disk formatted and has it ever worked on your iMac? I suspect it's formatted for the PC as NTFS which OS X will read but not write to. If you must share this disk with both your PC and Mac then you should first determine how it's formatted and if it can be shared. In the event it's formatted as most external HD's for NTFS then I'd recommend downloading and installing NTFS-3G will allow the Mac to write to it. You can find this at:
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SMC RESET
Shut down the computer.
Unplug the computer's power cord and all peripherals.
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
Press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
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Release the keys.

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Backstory:
I was in the process of installing Windows 7 using boot camp, but I was a little bit low on HD space. So, I deleted the user account that had a ton of stuff, and did some other crap that messed up my hard drive. So my computer just won't boot. It shows a gray screen 24/7, going into safe boot/safe boot + verbose doesn't fix the problem. I tried booting from an OSX Leopard dvd, but it won't work when I hold down C, and when I choose the Mac OS X Install DVD option after holding the option key, when I click the arrow button it freezes and doesn't boot. I have Lion installed, and apple says not to boot with an older version of OSX DVD, but there is no Lion DVD.
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Rockswim,
did it do that only once, or does it do that every time you restart it?

Grey Screen on Start up and Hard disk not working

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