15" iMac G4 800Mhz will not boot up

Hello all,
I have a 15" iMac 800Mhz G4 system with 512ram that will not boot up unless I take out the memory and reinsert it every time before a start up. I get a blank grey screen unless I pull the memory stick out and put it back in. Any ideas ? I tried a different stick of memory but had the same problem ? confused.
When the system is running it runs like a champ! I cant afford a new mac at this time or a heavy repair fee
Thanks
Dan
iMac 15" 800Mhz Mac OS X (10.4.8)
iMac 20" 2ghz Mac OS X (10.4.3)

Its a second hand Mac I bought used and it came with no disc, I am running 10.4.8 if that helps. I do have OS X disc from a PowerBook and iBook
The Memory is a Apple 256 stick dont know how old it is since I bought the iMac used
How do I run a hardware test ?
Thanks
Dan

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Imac crashed and will not boot up

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I agree with BGreg that you should run Apple Hardware Test , however run it in Extended Mode. If no errors turn up run it several times. It's a lengthy test so be patient. Also here is what Apple says about your symptoms in Gray progress bar appears under Apple logo during startup.
I hope you have been backing up your system, if not then if you can boot into Safe Mode as suggested you should immediately backup using either a clone or Time Machine. That should be the #1 priority to preserve your data.

My 15" iMac G4 800mhz will not recognize my iPhone 4s at all. Please Help, There is more information below. Thanks.

My 15" iMac G4 800mhz will not recognize my iPhone 4s at all. It charges but doesn't load as external memory or in itunes.
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....and an 800mHz Mac cannot officially run 10.5.8. There may be some third-party hacks to allow tricking the installer into thinking the computer qualifies and permit the install to continue, but 10.5 will be very sluggish on that machine even if you have a lot of RAM.
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IMac Late 2006 Will Not Boot Up

I have a late 2006 iMac. The problem I have is that it will not boot up. I press the power button and the light comes on but the display is blank. Do you all think the problem is the logic board?
Thanks in advance,
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Could be. Is it that the display is blank but the system is running???? If so, what if you connect an External Monitor.
My iBook has been having Logic Board issues similar to what you say though, but it's because of a chip on the lower side of the board that become desoldered. I ended up putting a small piece of rubber onto it to apply pressure onto the chip once I reapplied the case/undercover. It works & I backed up everything, but it sometime acts up again with similar symptoms as your iMac.

Imac 27 Intel will not boot normally only in Safe Mode

I posted previously but the answer to the question was did it wake up in safe mode, i did not give it a chance and I restored from back up to 10.10, upgraded to 10.10.1 and it worked for 1 week and returned to the previous problem.
I ran AHT - Passed, reset PRAM, verified disc - Passed, repaired permissions and removed each RAM module and still will only boot in safe mode. The crash report is below.
It locked up while on Safari, and wake up. When booting it loads the first 25% then goes to grey screen and stays there with spinning beach ball or just pointer never goes to log in screen.
In Ten (10) Crash logs it gives me the following reason:
Process:               fontd [337]
Path:                  /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ATS.framework/Versions/A/Support/fontd
Identifier:            fontd
Version:               375
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           fontd [337]
User ID:               501
Date/Time:             2014-12-26 12:21:45.036 -0500
OS Version:            Mac OS X 10.10.1 (14B25)
Report Version:        11
Anonymous UUID:        3D86DE4D-DF6F-C140-16F8-4F80DBCD6634
Time Awake Since Boot: 250 seconds
Crashed Thread:        2 Dispatch queue: Scanner Queue
Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       EXC_I386_GPFLT

EtreCheck version: 2.1.5 (108)
Report generated December 28, 2014 at 2:44:03 PM EST
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Click the [Adware] links for help removing adware.
Hardware Information: ℹ️
iMac (27-inch, Late 2009) (Verified)
iMac - model: iMac11,1
1 2.66 GHz Intel Core i5 CPU: 4-core
12 GB RAM Upgradeable
BANK 0/DIMM0
2 GB DDR3 1067 MHz ok
BANK 1/DIMM0
2 GB DDR3 1067 MHz ok
BANK 0/DIMM1
4 GB DDR3 1067 MHz ok
BANK 1/DIMM1
4 GB DDR3 1067 MHz ok
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
ATI Radeon HD 4850 - VRAM: 512 MB
iMac 2560 x 1440
System Software: ℹ️
OS X 10.10.1 (14B25) - Uptime: 2:13:47
Disk Information: ℹ️
ST31000528ASQ disk0 : (1 TB)
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / : 999.35 GB (528.66 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
OPTIARC DVD RW AD-5680H
USB Information: ℹ️
HP Officejet 6500 E709n
Apple Internal Memory Card Reader
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Alcor Micro Corp USB Card Reader
Apple Computer, Inc. IR Receiver
Apple Inc. Built-in iSight
Firewire Information: ℹ️
LaCie d2 DVDRW FW/USB 400mbit - 400mbit max
LaCie d2 Quadra v3C 800mbit - 800mbit max
EFI (disk1s1) <not mounted> : 210 MB
Time Machine (disk1s2) /Volumes/Time Machine : 2.00 TB (251.43 GB free)
LaCie d2 quadra (button) 800mbit - 800mbit max
EFI (disk2s1) <not mounted> : 210 MB
2T Photo's & Video (disk2s2) /Volumes/2T Photo's & Video : 2.00 TB (944.02 GB free)
Gatekeeper: ℹ️
Mac App Store and identified developers
Kernel Extensions: ℹ️
/Applications/Toast 10 Titanium/Toast Titanium.app
[not loaded] com.roxio.BluRaySupport (1.1.6) [Support]
/Library/Extensions
[not loaded] com.microsoft.VirtualPC.Networking.1028 (7.0.3) [Support]
[not loaded] com.microsoft.VirtualPC.Networking.1040 (7.0.3) [Support]
[not loaded] com.microsoft.VirtualPC.OSServices (7.0.3) [Support]
/System/Library/Extensions
[not loaded] com.Belcarra.iokit.USBLAN_netpart (2.0.2) [Support]
[not loaded] com.Belcarra.iokit.USBLAN_usbpart (2.0.2) [Support]
[not loaded] com.Logitech.Control Center.HID Driver (2.6.0) [Support]
[not loaded] com.RemoteControl.USBLAN.usbpart (2.0.6) [Support]
[not loaded] com.aliph.driver.jstub (1.1.2) [Support]
[not loaded] com.elgato.driver.DontMatchAfaTech (1.1) [Support]
[not loaded] com.elgato.driver.DontMatchCinergy450 (1.1) [Support]
[not loaded] com.elgato.driver.DontMatchCinergyXS (1.1) [Support]
[not loaded] com.elgato.driver.DontMatchEmpia (1.1) [Support]
[not loaded] com.elgato.driver.DontMatchVoyager (1.1) [Support]
[not loaded] com.wacom.kext.wacomtablet (6.1.1) [Support]
[not loaded] com.wdc.driver.1394HP (1.0.8) [Support]
[not loaded] com.wdc.driver.USBHP (1.0.10) [Support]
/System/Library/Extensions/Belcarra.USBLAN_netpart.kext/Contents/PlugIns
[not loaded] com.belcarra.iokit.netpart.panther (1.6.1) [Support]
/System/Library/Extensions/Belcarra.USBLAN_usbpart.kext/Contents/PlugIns
[not loaded] com.belcarra.iokit.usbpart.panther (1.6.1) [Support]
/System/Library/Extensions/RemoteControl.USBLAN_usbpart.kext/Contents/PlugIns
[not loaded] com.RemoteControl.USBLAN.panther (1.6.1) [Support]
/Users/[redacted]/Desktop Pictures/Icons/ /WD Firmware Updater v2.1.9.0.app
[not loaded] com.wdc.driver.WdDeviceType00 (1.1) [Support]
/Users/[redacted]/Library/Services/ToastIt.service/Contents/MacOS
[not loaded] com.roxio.TDIXController (2.0) [Support]
Launch Agents: ℹ️
[invalid?] com.wacom.wacomtablet.plist [Support]
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist [Support]
[loaded] com.microsoft.office.licensing.helper.plist [Support]
User Launch Agents: ℹ️
[loaded] com.adobe.ARM.[...].plist [Support]
[loaded] com.google.keystone.agent.plist [Support]
[running] com.mlbam.nexdef.plist [Support]
[running] com.netputing.airprintactivator.plist [Support]
[invalid?] com.swarmcast.mlbnexdefautobahn.plist [Support]
User Login Items: ℹ️
SoundTouch music server Application (/Applications/SoundTouch/SoundTouch.app/Contents/MacOS/SoundTouchMusicServer/S oundTouch music server.app)
EarthDesk Core Application (/Users/[redacted]/Library/PreferencePanes/EarthDesk.prefPane/Contents/Resource s/EarthDesk Core.app)
EarthDesk Core Application (/Users/[redacted]/Library/PreferencePanes/EarthDesk.prefPane/Contents/Resource s/EarthDesk Core.app)
Internet Plug-ins: ℹ️
WacomNetscape: Version: 1.1.0-5 [Support]
Default Browser: Version: 600 - SDK 10.10
Flip4Mac WMV Plugin: Version: 2.4.2.4 [Support]
WacomSafari: Version: 1.0.1 [Support]
RealPlayer Plugin: Version: Unknown [Support]
Silverlight: Version: 5.1.10411.0 - SDK 10.6 [Support]
FlashPlayer-10.6: Version: 16.0.0.235 - SDK 10.6 [Support]
Flash Player: Version: 16.0.0.235 - SDK 10.6 [Support]
QuickTime Plugin: Version: 7.7.3
iPhotoPhotocast: Version: 7.0 - SDK 10.8
SharePointBrowserPlugin: Version: 14.4.3 - SDK 10.6 [Support]
AdobePDFViewer: Version: 9.5.5 [Support]
CouponPrinter-FireFox_v2: Version: Version 1.1.6
GarminGpsControl: Version: 4.0.3.0 Release - SDK 10.6 [Support]
JavaAppletPlugin: Version: 15.0.0 - SDK 10.10 Check version
User internet Plug-ins: ℹ️
WebEx: Version: 1.0 [Support]
WebEx64: Version: 1.0 - SDK 10.5 [Support]
Google Earth Web Plug-in: Version: 7.1 [Support]
Safari Extensions: ℹ️
Keeper - Password and Data Vault [Installed]
Add To Amazon Wish List [Installed]
3rd Party Preference Panes: ℹ️
EarthDesk [Support]
Flash Player [Support]
Flip4Mac WMV [Support]
Logitech Control Center [Support]
MacFUSE [Support]
TiVo Desktop [Support]
Time Machine: ℹ️
Skip System Files: NO
Auto backup: YES
Volumes being backed up:
2T Photo's & Video: Disk size: 2.00 TB Disk used: 1.06 TB
Macintosh HD: Disk size: 999.35 GB Disk used: 470.68 GB
Destinations:
Time Machine [Local]
Total size: 2.00 TB
Total number of backups: 68
Oldest backup: 2014-03-22 15:08:16 +0000
Last backup: 2014-12-28 16:37:12 +0000
Size of backup disk: Too small
Backup size 2.00 TB < (Disk used 1.53 TB X 3)
Top Processes by CPU: ℹ️
      15% backupd
      8% com.apple.WebKit.Networking
      2% coreservicesd
      2% WindowServer
      1% AddressBookSourceSync
Top Processes by Memory: ℹ️
296 MB mds_stores
296 MB Safari
245 MB EarthDesk Core
142 MB Mail
90 MB WindowServer
Virtual Memory Information: ℹ️
3.99 GB Free RAM
4.45 GB Active RAM
3.37 GB Inactive RAM
1.07 GB Wired RAM
7.92 GB Page-ins
2 MB Page-outs
Diagnostics Information: ℹ️
Dec 28, 2014, 01:48:01 PM /Library/Logs/DiagnosticReports/Aperture_2014-12-28-134801_[redacted].hang
Dec 28, 2014, 12:30:56 PM Self test - passed
Dec 27, 2014, 03:32:39 PM /Library/Logs/DiagnosticReports/backupd_2014-12-27-153239_[redacted].cpu_resour ce.diag [Details]
Dec 27, 2014, 03:29:58 PM /Users/[redacted]/Library/Logs/DiagnosticReports/fontd_2014-12-27-152958_[redac ted].crash
Dec 27, 2014, 03:29:55 PM /Users/[redacted]/Library/Logs/DiagnosticReports/fontd_2014-12-27-152955_[redac ted].crash
Dec 27, 2014, 03:17:56 PM /Library/Logs/DiagnosticReports/Kernel_2014-12-27-151756_[redacted].panic [Details]
Dec 26, 2014, 12:21:45 PM /Users/[redacted]/Library/Logs/DiagnosticReports/fontd_2014-12-26-122145_[redac ted].crash
Dec 26, 2014, 12:21:43 PM /Users/[redacted]/Library/Logs/DiagnosticReports/fontd_2014-12-26-122143_[redac ted].crash

Pre-Intel Imac G5 17" Will not boot past safe mode, tried everything!

I have a 17" Imac with leopard that has been working fine until just recently stopped booting in anything other than safe mode. It will load the apple screen fine, then a ghost mouse image appears in the top left corner, which then appears, and sticks like you can move it. The blue screen appears and you now have your normal mouse that you can move around with the other one still froze in place, then the blue screen turns dark blue, then black and thats it. Your left with the mouse and a black screen and nothing else. I have tried resetting the ram, the hard drive checker command, apple, F O commands, single user mode, I checked the LEDS on the back the first one is always on, the second comes right on and the third lights when its supposed to. I did a complete erase and install of leopard and when the computer booted up you saw the the ghost arrow, and the same thing, but I waited awhile and you could hear the "Welcome to Leopard" music playing in the background It just doesn't make sense why the computer is not booting. Any advice is appreciated. I have tried it all. I am an apple lover, but this is one time where I am honestly about to throw it to the road.

Welcome to Discussions - from what I have seen, this could be your capacitors on your logic board about to fail, I'm afraid the cure would be a new logic bard. If you can take the back off and check to see whether the tops of the caps are bulging, that would be a definitive clue.

Imac g5 ALS will not boot from internal HD or portable drive or eject disc

I cannot get my g5 ambient light sensor Imac to boot from the internal hard drive or a portable drive. I have tried multiple keystroke combinations (c + power on, option + power on, and others) upon startup and all get the same response: the computer powers on and the screen displays the apple logo. after a minute or two, the screen darkens, and a multilingual message appears telling me that I need to restart the computer. I cannot get far enough to start from a different drive or a system software disk. I cannot eject the disc currently in the drive. I cannot run any diagnostic software, cannot reinstall system software or put another disc in the drive. obviously, I am experiencing hard drive problems, but I cannot seem to get past this frustrating stumbling block. any troubleshooting or problem solving would be greatly appreciated. I have checked other discussions and support forums, but cannot find any that reference the specifics that I have mentioned. I have researched and tried the logic board check and many other potential "solutions", but none of the discussions mention the gray screen "you must restart your computer" message that I continually receive.

What you are experiencing is called a Kernel Panic.
First, to get the disc out of the drive, hold the mouse button down as you reboot.
Have you tried resetting the SMU?
1. Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
2. Unplug all cables from the computer, including the power cord.
3. Wait 10 seconds.
4. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
5. Let go of the power button.
6. Press the power button once more to start up your iMac.
Then try booting from your install disc and running Disk Utility:
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk.
Please post back with results,

My intel iMac 2007 24" will not boot beyond a blue screen

I have checked the hardware and everything is good. I have used the disk utility and all is good what can I do next?

Did you repair disk permissions with disk utility as well, if yes then try to start you system in safe mode (hold down the shift key while restarting).

My iMac will not boot into the Apple Hard Ware test. Why is this?

I have a late 2012 27 inch iMac. It will not boot into the Apple Hard Ware test. I do have File Vault turned on. Will this stop it from booting in to the test?

See Using Apple Hardware Test. For some Apple computers that shipped with OS X Lion, if Apple Hardware Test cannot be found on the hard drive, an Internet-based version starts up instead. An Internet-enabled connection via ethernet or Wi-Fi is required to use this feature. Some computers that shipped with Lion require a software update to use this feature. See Computers that can be upgraded to use OS X Internet Recovery for more information.
Note: your machine cannot be running Mac OS X (10.6.7).
27" i7 iMac (Mid 2011) refurb, OS X Mavericks (10.9.4), ML & SL, G4 450 MP w/Leopard, 9.2.2

TS1587 iMac will not boot. Monitor lights up with squiggly little lines, but that's all. Help??

My iMac 24" inte will not boot. Monitor lights up with squiggly little lines, but that's all. Help??

Can you run Apple Hardware Test. In you case it is not so much to see what it finds but to see whether you can boot it at all.
Or try a safe boot.
It may be time to take to apple for repair.

Flat Screen imac iMac won't boot up, will not boot from DVD

My 24" imac flat screen will not boot. I only get a blank gray/white screen. Reset the PRAM and tried to boot from the DVD. I held the C key down when I powered on but the system will not boot from the DVD. If I wait long enough, the DVD will eventually be ejected. I have had HD issues and Disk Warrior indicated that the drive was damaged. Will a dead hard drive cause the system to not boot from the DVD? Is there any way to get the system to boot from my DVD?

Hello PMcDer,
Welcome to Apple Discussions!
By what you are describing you're correct in believing your drive is probably gone. The sad news... if Disk utility can no longer see the drive, your ability to retrieve any data off of it is getting slim.
There are a couple of options for data retrieval.
1. If you still have Apple Care have them fix it. But make sure they know that you do not have a backup.
2. If you do not have Apple Care, have an Authorized Apple Tech replace the drive and make sure that they will give you back the old drive. This may prove to be a challenge. Or you can replace the drive yourself. It is not easy for some but take your time and you'll have no problems. Lots of youtube videos on this as well as on-line tutorials.
3. You could try a Hard Disk Utility program like Disk Warrior to see if it can help, but it's not free.
4. You could pay someone big bucks for Data recovery in order to get the data of the drive for you.
If you decided to do the HDD swap yourself. You could purchase a 3.5" firewire enclosure that you could put your old drive into once you do the swap. Plug it into the iMac and prey that it recognizes it. Then "MAYBE" you could copy the data over to the new drive, but that is a stretch.

Intel iMac will not boot past gray screen

Intel iMac will not boot past gray screen
my system:
new (month old) 24" intel imac, 2.8 ghz, 4 gb ram.
running: leopard (upgraded from tiger, which was pre-installed at purchase), installed 10.5.1 update right before this huge problem occurred.
install discs on-hand: two-disc tiget set, single leopard upgrade disc.
what led to this:
i wanted to install windows using bootcamp on a 50 gb partition.
at this point i was running leopard 10.5
i followed all bootcamp instructions, printing out the guide, as well. once i got into the windows setup, i was prompted to choose a partition to install windows. unlike the bootcamp guide, which showed three partitions, one clearly labeled "bootcamp", i saw only one partition. not wanting to risk writing over my mac partition, i quit the setup and rebooted the mac os. after some googling around, i looked for firmware updates (didn't need any), and then software updates. i decided to try updating to 10.5.1.
i then ran through boot camp again, deleting my previous windows partition, creating a new one, and moving forward as before. once again, i was only shown one partition to choose from in the windows setup. i exited the setup again to reboot through the mac os, but this time, i was only given a blank gray screen.
here's what i have tried so far:
booting from a CD, holding down the C or D keys: no response (in fact, i have to restart the computer holding down the mouse button to be able to eject the CD)
booting with option key held down: gray screen
booting with option key held down with external bootable firewire drive attached: the firewire drive appears as a boot icon, and i can click on it within a five second window, but then the screen freezes after that time period, and nothing changes
booting into target mode while attached to another mac: gray screen (no firewire icon, and drive never shows up on other mac)
resetting NVRAM: i'm able to hear the boot chimes, but no difference in performance. gray screen every time
Safe boot: nothing but a gray screen
Verbose mode: gray screen
Single user mode: gray screen
Single user mode with firewire drive attached: occasionally (not every time), i am able to get the white on black terminal to show up. from here, i'm able to run fsck, but it appears to only be checking the firewire drive. i have tried several times to boot from here, and once it took me to a blue screen with movable arrow cursor, but it never went beyond this.
is there anything else left to try before taking it to apple?
any help would be greatly appreciated.
thanks,
Casey Burns
Casey Burns Illustration and Design
http://CaseyBurns.com

I'd call Apple support at this point. You'll need
to put this issue on the record.
Call U.S. iPod and Mac technical support: 1-800-APL-CARE (1-800-275-2273)
The wait may be long for an agent to come on the line
so expect that and have some other stuff to do in the meantime.
If you have the applecare protection plan, I'd ask about "onsite"
service.
I like your work ! Good luck !
Slim
Message was edited by: slimpikkunz

Install Disk for Snow Leopard will not boot on an iMac 27in

My Install Disk for Snow Leopard will not boot on my iMac 27in. The Apple Logo is the only thing the user will see. The current OS on the system is 10.6.6. Upon placing the Snow Leopard DVD in the system, the DVD players spins for a few seconds and displays the Apple Logo. Nothing happens after 20 minutes.

Yes, it is ridiculous how it is impossible to install Snow Leopard. I have two Snow Leopard DVDs: one that I purchased for a Macbook soon after it's release (10.6.0), and one that came with my iMac (10.6.4). Both of these boot up my Macbook (running 10.6.7) just fine. My SL 10.6.0 DVD mounts onto my iMac (Lion 10.7.0), but you cannot run the install. I attempted to boot from this DVD and got the infinite white screen and Apple logo, as some have reported above. The other SL 10.6.4 DVD will not even mount in Lion, and will not even show up as a bootable drive when I attempt to select it after holding alt/option on reboot.
I created a bootable external drive from SL 10.6.0, attempted boot, same infinite white screen/apple logo.
I created a bootable external drive from SL 10.6.4 on my macbook. I attempted to boot from this drive, and got the white screen of death, except that this time I actually got the loading symbol underneath the Apple logo. After about a minute of attempting to boot, the Apple logo changed to a circle with a diagonal line through it (the "NO!" sign).
I took my iMac to the genius bar. They inserted SL 10.6.0, which would not boot. Then they determined that my computer had to run 10.6.4 and later. So, they restored an image of SL 10.6.4 onto my partition (not an install from an image, but an image of SL already installed). Hurray! Snow Leopard was successfully shoved onto my iMac!
I then deleted a third partition on my hard drive I did not need anymore, which somehow screwed up my SL partition (even though it said "Will not erase partition SL or Macintosh HD). Now I am back at square one, and I guess I need to take my flippin iMac back to Apple for them to do what I should be able to do.
I like Apple, but sheesh do I hate Lion right now.

Brand new iMac will not boot, just make's funny "bonk" sound.

I have a brand new iMac (Intel, 20-inch flat panel). Just out of the box. Ran through set-up wizard. Used firewire to transfer files from an old CRT iMac. All was good for about an hour.
Tried to empty the trash. Finder says Trash was emptied, but, if I open the Trash, the 50-odd files I just deleted are still visible! If I try to select one, its icon immediately disappears. Hmmm....
I decide it's time to restart.
Upon restart, computer will not boot.
I push the power button. I hear the startup chime as usual. Screen lights up gray. But no apple logo on the screen. There is a long pause. Screen remains gray. Computer then starts making a soft "bonk" sound every 4-5 seconds. (Kind of hard to describe the sound, just imagine clipping the very first fraction of a second of the normal Mac startup chime, and repeating it every couple seconds.) This continues indefinitely.
If someone has experienced this, or has advice, please let me know your thoughts. Feeling rather bummed. Thanks in advance!!!
iMac Intel 20-inch 2.16 GHz Mac OS X (10.4.8)

Boot from the Install Disk 1
I cannot boot at all (see my post above). The
machine just sits there with a blank gray screen.
I appreciate the article link, though. I've already
read it and it will make a great reference for the
future, provided I can get back to a place where this
iMac actually runs.
Since you're new to Macs, I'm sure you don't realize that while your iMac is sitting there with only a gray screen, you can insert/push in "Install Disc 1" - and it will be accepted. Then press and hold down the power button until iMac shuts down. After waiting a few seconds until everything has settled, press power button and immediately upon hearing the usual Mac startup tone/chime/chord hold down the "c" key until you see the spinning progress indicator below the Apple logo. It will boot to the DVD, you will be able to use (from the Utilties pull-down menu) Disk Utility to "repair" the hard drive directory, then you will be able to quit the installation process, choose Startup Disk from that same Utilities pull-down, and restart your iMac:)

Intel IMac will not boot OSX Tiger

Hi guys, I just wanted to let you know that I am reading and trying to do my home work on why my Intel I-Mac will not boot. It all started after running Windows Vista using Apple Boot Camp. I just wanted to list a few things I have tried after getting replies from posting in some other forums. I will try here since a few people are having similar issues. Any tips would be appreciated. Please no flames
1. If I hold the C button while booting to boot from CD-ROM I get a panic alert.(panic alert meaning lockup, I have to restart or press and hold power button)
2. Holding down D button upon startup will run Apple Hardware test just fine, but no errors found.
3. I can press Option-Command-P-R to reset NVRAM successfully.
4. I can press Option during startup to start the Startup Manager. I can see my Macintosh Hard Drive and CD-ROM, but get a panic alert if I click on either icon. I’m not sure what happened with the Windows Vista hard drive Icon.
5. I can press N during startup to start up from a compatible network server. I see a flashing globe and then a panic alert. Not sure what this function is for.
6. If I press T during startup for Start up in FireWire Target Disk mode, I get a weird symbol that looks like a Y floating around the screen. I have no idea what target disk mode means.
7. If I press Shift during startup to boot in Safe Boot mode, I get a panic alert.
8. If I press Command V during startup for Verbose mode, it appears that I am at a Unix style Command Prompt that hangs.
9. If I press Command S during startup for Single-User mode, I am at the Unix Command prompt which works, but I do not know any commands except fsck –fy which I guess is like a DOS CHKDSK command that tells me my Volume appears OK.
10. Pressing Option-N during startup to start from a NetBoot server using the default boot image gives me the flashing globe icon again, and then hangs.
11. I tried resetting the System Management Unit thanks to the Unix forum guys, but still have the same problems.
12. My next step is to find a Mac friend to burn the Firmware Restoration CD file I downloaded thanks to Michael from the Unix forum. If that does not work I will try whatever you ask.
13. I can boot my I-Mac using a Linux Live CD called Slax and surf the net and play with the software. It runs just great; I just don’t think this 200MB version has the capabilities to format the hard drive or Install to hard disk like Fedora Live does. By the way, the Fedora Live version of Linux hangs after booting from the CD. It boots just fine on my PC.

Greetings,
Somehow or other you will need to be able to boot to the Installation Disk #1 that came with your computer - as you know they are specific to each machine model. After a successful boot to that disk, you can use Disk Utility to remove all of the partitions, wipe that puppy clean, then repartition and make sure you use the GUID partition scheme - you really only need the Bootcamp Assistant if you have multiple drives, internally, and since you have an iMac, your good to go.
When you booted to your Linux disk, could you see the internal hard disk? If so you should be able to open one or two of the folders just to be sure that the disk is OK.
A worst case scenario would be to have to install a fresh hard drive. Do you have any way of borrowing another install DVD for that model to try to get it to boot? That's the key to this whole project.
Try this - Go back into single user mode and issue these two commands in this order:
/sbin/fsck -fy
/sbin/mount -uw /
Watch the spaces and then issue a "reboot" at the prompt.
During this, the fans will likely come on at a high speed and may stay on for a while and maybe until you do a shutdown and reboot.
I hope this helps a little, and once you get the machine booting to the Installation Disk #1, again, you'll be all set.
You don't say, but is this unit under warranty - I know it may be a stupid question on my part, but if it is, give them (Apple) a call and get some advice on the waranty actions.
Good Luck my friend.
Cheers,
M.

15" iMac G4 800Mhz will not boot up

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