OS 10.4 install disk freezes on mounting

OS 10.4 install disk freezes. I had a problem with AppleWorks 6.2.9 not launching. It had been working in my 2-week old 20" iMac Intel Duo updated to 10.4.7. (Restarting solved that problem.) But I wanted to run disk repair from the install disk. After restarted from the disk (holding down C), it was mostly frozen, language selectons, etc. in first window. I was able to launch disk utilities from the menu bar. When I selected HD the selection only showed as a dim gray bar, not blue, and clicking repair was inoperative. This was pretty much the story for the other options: nothing worked including restart, start-up disk and cancel. I could launch the windows but not use or close them. I could not shut down with the power button. In the end the only way I could shut down was to pull the plug. The install disk looks fine. I tried the hardware test feature(restarting holding down D) and a small crude computer and chip display came up with a language choice menu, no menu bar at the top, all choices inoperable. I was able to shut down this time with the power button. I tried for disk repair again, restarting again holding down C, and this time there was not even a menu bar display at the top, just the language choice, inoperable. Power button inoperable. Pull plug to shut down. Permissions repair worked in disk utility in HD/Applications/Utilities.
There have been a number of quirks and problems in the two weeks I've had the computer. There were Mail and Calculator problems, fixed by deleting com.apple.LaunchServices-0140.csstore. At times aliases on the launch bar will launch the Applications folder rather than the application itself. There was a momentary problem with Drag Thing (4.5.2) launching and showing for a time only in dim outline (otherwise works fine).
Imac Intel Duo 20 Mac OS X (10.4.7) 2-weeks old

Actually the problem was not the mouse but how I was handling it. This was discovered after another lengthy work out with Apple Support. (TG for Support!)In the install and test modes the right sensor is not active once the disc is mounted. The left front of the mouse is active. The sides in the front are referred to as buttons. . . . An earlier article may be of interest, ID: 302516, October 07, 2005: "iMac G5 (iSight): Mighty Mouse right button doesn't work when installing Mac OS X." I would say this is solved then, except I have a niggling worry why I seem to be the only one experiencing the problem? Be that as it may, it is solved for my computer: when install is booted only the left "button" is active; the right will produce erratic or no result.

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Applications will not launch and install disk will not mount

Just recently my applications have taken a turn to not wanting to launch. These include anything from Dashboard to the Microsoft Office Suite. It also includes anything that is downloaded form the internet, like the World of Warcraft download client. Long story short, the errors that I constantly get are
System/Library/Frameworks/ApplicationServices.Framework/versions/A/Frameworks/Co reGraphics.Framework/versions/A/CoreGraphics
I figured that with it being a system library issue and the Repair Disk Permissions has been completely useless, that a complete restore would be in order. And I was wrong. For some reason my Genuine 13-inch MacBook Pro Mac OS X Install DVD will not mount. Meaning I out the DVD in said drive and it will attempt to mount but will eventually give up and eject itself. I can load any other cd/DVD into my drive and it will mount without a problem.
Everything is up to date software wise.
About my mac:
2009 MacBook Pro Unibody
Apple OS X 10.6.8
Processor: 2.53 GHz Intel
Memory: 4GB 1067 MHZ DDR3
Apps that won't open due to System/Library/Frameworks/ApplicationServices.Framework/versions/A/Frameworks/C oreGraphics.Framework/versions/A/CoreGraphics
Dashboard                            (OS based)
Finale NotePad 2008.           (Downloaded from Internet)
iTunes.                                  (OS based/internet)
Google Earth.                       (Internet)
Microsoft Word.                    (Student Disk Download)
Safari (more less, it has it's moments of working)
Plus probably more but I think you may get the idea.

Check the disk for scratches and wipe it with a lint free cloth.
CD/DVD Loading Problems
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CD/DVD Drive - Troubleshooting
CD/DVD Drive - Troubleshooting (2)

OS X 10.5 Leopard install disk won't mount

I'm running OS X 10.4.11 on an iMac G4 and want to upgrade to OS X 10.5. I bought a retail 10.5.1 installation DVD set but I can't get the disks to mount on my iMac G4. I've tried loading it in with OS 10.4 running and I've tried starting up from the 10.5 disk holding down the C key. I've also tried starting up holding down the option key. Nothing seems to work. The disk does not show up in disk utility. The disks are apparently ok because I can mount them on my intel iMac as a test.
Any help would be greatly appreciated.
Thank you

Some Macs are not able to boot from USB drives.
These options come to mind:
1 - Make a bootable USB stick - very slow and painful - several tutorials on the web
2 - Make a reduced (single layer DVD) - not too difficult - I have done it several times - let me know if you decide to do this - I can give you a list of items to remove.
3 - Partition your G4 hard drive, boot into installer on one volume and install onto the other volume - very fast and easy - useful in the future - if G4 has important data this will need backing up to another disk first as partitioning normally erases the whole disk.
For 3:
1 - If necessary backup all data, and perhaps whole disk, to another disk with eg Carbon Copy Cloner
2 - Use Tiger install CD/DVD to partition G4 disk - can be equal volumes or perhaps make one about 10 GB for installer.
3 - Install Tiger onto one volume - the larger one if they are different
4 - Boot into Tiger volume
5 - Use Carbon Copy Cloner to clone Leopard installer onto the other volume
6 - Boot into installer and use it to replace Tiger with Leopard
In future you can use the installer volume in the same way that you would use an installer DVD for repair or reinstalls etc.
Good luck.

Issues with BootCamp and mounted windows 8 install disk

I've been trying to install Windows 8 from a mounted Windows 8 System Builder install disk. When I mount the ISO and try to use bootcamp to install windows 8 the bootcamp application will not recognize the install disk I have mounted. Any issues? I've also attempted to install the disk on USB with no luck. The reason I need the mounted ISO is because my DVD drive is busted. I created ISO on a friends macbook pro by using disk utility. I have the dmg file, cdr file, and iso file but have had no luck with any of them. Can anyone help? I'd really like not to have to have to buy an external DVD drive.

Google is your friend. Easy? Probably not but it appears doable. Proceed at your own risk.
http://arstechnica.com/information-technology/2012/11/no-support-no-problem-inst alling-windows-8-on-a-mac-with-boot-camp/

Disk Utility says everything's fine, but Install disk doesn't find my internal drive as a possible destination. When I startup with Command S, I get a looping "cannot mount errno = 19" message.

Disk Utility says everything's fine, but Install disk doesn't find my internal drive as a possible destination. When I startup with Command + S, I get a looping "cannot mount errno = 19" message.
Problem started when I used Tech Tool Pro 6 to "de-fragment volume". Had to cancel that process before it finished because I ran out of time. Thereafter, when I startup my machine normally, I get the gray Apple logo at first, but it changes to a prohibited symbol (circle with a slash thru it) and hangs.
When I startup holding the Option key, I can see my internal drive, but I get the same results as above.
When I startup using the MacBook OSX Install DVD, it does not find my internal drive as possible destination.
When I startup using the MacBook OSX Install DVD and then run Disk Utility, it finds my drive, allows me to "repair" and says everything is fine.
When I startup with Command + S, I get a looping error message "errno = 19" and cannot stop it to do anything else.
When I startup from Disk Warrior v4.4, it does not find my internal drive to do any repairs.
When I startup from Tech Tool Pro 6 and run the "computer check" diagnostics, everything passes but the Volume Structure, which fails at "Volume Extents (B-tree)." When I use TTP's "Tools" option to run "volume repair" it will show my internal drive and allow me to click the GO button, but nothing happens and nothing changes.
I have a Time Machine backup on an external USB drive, but for as long as the internal drive doesn't mount, I can't use the backup to restore.

It's a false report and should be ignored.
I would not rely on TT as I've already said earlier even before Grant posted similar advice.
I really think the Rigid Disk Block may be corrupted. This holds the partition map and could prevent a volume from being unmounted. Unfortunately, there is no way to fix that without repartitioning the drive which will remove everything. So, before going down this road I hope you have backups or can make a backup.
Drive Partition and Format
1. Boot from your Snow Leopard Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. Quit DU and return to the installer. Proceed with reinstalling OS X.
5. Download and install Mac OS X 10.6.8 Update Combo v1.1.

Pismo running Panther won't mount retail install disk

I'm appealing to the vast wisdom of the collective--cuz, man, I'm stumped...
I just inherited a Pismo, which is currently running Panther 10.3.8. I don't have the original disks that came with it. I DO have a retail version of Panther, which I purchased for my G4 desktop.
What I want to do is do a clean install of Panther on the Pismo's current hard drive (get rid of all old files & get it ready to sell), plus I've got a new hard drive on order, which I'll want to install Panther on, too.
The problem is the Pismo just flat out won't recognize the Panther install disks. I hear it spinning and whirring away, bless its little heart, but then it just gives up. No joy. The Combo drive will recognize/mount/play any and all CDs and DVDs I've thrown into it--just not the Panther install disks.
I've upgraded the firmware. I've tried running the disks in OS 9 (which gives me a "this disk is unreadable" message). The Pismo meets all the system requirements (which it had to, since someone before me got Panther to install somehow!)
Any ideas?

The Panther CDs are practically new & spotless, no peripherals are connected, and the PRAM got reset when I updated the firmware.
It's quite possible I have a failing DVD-ROM drive, but unless I'm reading it wrong, it's not made by LG. My Combo drive says it's a Matsushita SR-8174.
So, great suggestions, but I don't think we've quite dialed it in yet...
In my travels through the Googlesphere, I found one woman's posting in some forum with the exact same problem. Unfortunately, no one could help her and she seems to have given up. Also, a few references to vaguely similar problems that might have been solved by removing the non-original RAM (I have a 64 MB and a 128 MB in the two slots--within Panther's requirements, but I am ordering a 512 MB).
So on my end, I'll try it with more RAM (though, as I mentioned earlier, someone managed to install and run Panther just fine originally) and I'll head to our local independent Mac repair specialists to see if they can swap out the optical drive & see if that's the problem. But I'd still like it if the solution came from the wisdom of this incredible resource. Y'all rarely let me down--thanks.
A related question: if I connect the Pismo to my G4 desktop & start it up in Target Disk Mode, can I put the Panther disks in my G4 and wipe the Pismo & install Panther from there...?

Help when i boot into the windows 7 instal disk it freezes at windows loading files

Help when i boot into the windows 7 instal disk it freezes at windows loading files.

1. Have you tried both Alt keys - maybe your Alt key is dead.
2. Do you have wireless keyboard? Have you tried to change batteries? USB Keyboard?
3. If your Win is installed correctly then you have also installed all windows support software.
There should be Startup manager like on the Mac (next to the clock little bootcamp app or in control pannel) to restart your Mac into the Mac partition.

Mount volume from install disk

I am trying to restore the HD from an dmg image on my file server. How do I mount the share while booting off the install disk?

Mind posting what you did and not what you think you did? Others with a similar problem won't have a clue what worked.

Tiger install disk gets ejected, won't mount

Hello. I'm trying to upgrade my G5 to Tiger. The disk won't mount and gets ejected after about 30 seconds. I'm able to mount the Panther DVD. Any ideas? Thanks
Power Mac 1.8 Dual Mac OS X (10.3.5)

Is it a retail boxed version of Tiger or a restore copy that was included with another computer?
You'll want to get the retail version to upgrade your G5.

EMac - won't boot to install disk

I've got a G4 eMac (512Mb, Jaguar) that randomly freezes. These freezes do not occur in Safe mode. So I'm trying to reformat the HD and clean reinstall the OS. However, I cannot get it to boot to the original install disk. Any ideas?
Here's what I've tried:
*TechTools Plus shows no hardware issues; all tests pass.
*Hard drive is verified.
*Repaired permissions (ran 4x).
*I've zapped PRAM (3x)
*I've entered "set-defaults" and "reset all" in Open Firmware command line interface.
*CD in the drive will mount. I can browse files on the CD.
*I've tested the CD in another eMac and it will boot the computer. I actually have another eMac with install disks and they will not boot this problem eMac either.
*When I launch the OS install program and press the "Restart" button, the computer restarts but winds up booting from the HD (I can first hear the CD read head accessing the CD).
*When I hold down the Alt/Opt key on start up, it will not list the install CD as a boot option.
*When I press the "C" on start up, it still boots from the HD.
Shall I say, "Arrggh"?
Any help appreciated.

Interesting results. I was able to clean install the OS from another computer to the flaky eMac using the target mode as you described. From the other computer, I can even boot from the flaky eMac hard drive in target mode (start flaky eMac in target mode, start the other Mac while holding the Alt key and select the flaky eMac hard disk as boot option from the two listed.)
But I still cannot directly boot the flaky eMac (and Safe mode doesn't boot now).
I have repeated the following after OS install.
*reset PRAM
*entered "set-defaults" and "reset-all" in Open Firmware command line interface.
Am I running up against a hardware problem?

Disk images not mounting

Here's the question: how come .dmg files downloaded from apple.com (amongst other places) won't mount?
Here's the detail: This has to be a FAQ going by Google searches. I've downloaded the Mac Firefox DMG 3 times, and the Safari DMG from apple.com once, and when I try to mount the images I get a range of different cryptic errors, including "codec overrun", "not recognized", "error -some number or other", and so on. Sometimes, I get two different errors for the Safari image.
Existing disk images on my hard drive mount fine. Today my hard disk has been playing up, with files being corrupted, keychain being broken, prefs disappearing, and so on. I boot from the Tiger DVD, run Disk Utility and Repair Disk, tells me no repairs carried out as all hunky dory. Use Disk Utility on the HD to check permissions, those are fine. Run Onyx maintenance, all is fine. I've not changed the router prefs at all, so it's not that corrupting the downloads.
All was fine until mid-afternoon today, when a number of apps (Firefox, Safari, Dreamweaver) started behaving strangely and the machine kept on hanging. On restart a number of taskbar icons became question marks, so something's being corrupted. Some downloaded PDFs became corrupted.
What I might try to do is download DMGs from my work PC, put them on a stick, and try to mount them. If the problem recurs then that would eliminate download errors.
My conclusion is that either the OS has become damaged, or the HD is physically fubar'd, or at least has some physical errors on it somewhere which DU isn't picking up. If the latter I'm screwed as I'm out of warranty and I might as well chuck the machine in the bin, so let's hope it's the OS. I could reinstall the OS (again) but a) that would be highly time-consuming as I'd also have to reinstall a shedload of apps, prefs, configs, etc, and b) if there's a physical HD error it'll do zero.
I've already spent some fruitless and frustrating hours today on diagnosis, and having done tech supp in my career I know what to look for, so this is my last throw of the dice to try to get some kind person to suggest a) a diagnosis, and b) suggestions for a cure.
Without a cure I might as well take a clawhammer to the thing and get a Linux laptop. Ok, PCs are far inferior to Macs with crappy hardware, but at least you don't lose over a thousand quid when your PC laptop fails.
Cheers
Fred Riley
Web Developer, Nottingham, UK

I was able to get a partial fix of this problem by following instructions that I found on the All Experts web site:
Regarding disk images and mounting media:
delete the following files and folders:
* /System/Library/Extensions.kextcache (file)
* /System/Library/Extensions.mkext (file)
* /System/Library/Caches/com.apple.kernelcaches (folder)
(Note that after deleting these files you need to reboot your Mac for the fix to take effect.)
All of these files and folders were date 18 Aug 2009, which is in around the timeframe when I installed the last security update for OS10.4 ppc.
I say the solution is a partial fix, because it did allow me to open some, but not all .dmg files (the problematic ones are showing a checksum error). Now I find that iTunes will not operate (yeah I know that should be another thread), but I have not used it in several weeks, prior to the last OS update.

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.

Cannot boot from OSX install disk

I need to run disk utility to repair my boot drive.
I am attempting to startup from my OSX install disk. However, I can't seem to get my machine to do this.
My computer recognizes my install disk when it's in my superdrive. It mounts on the desktop and I can read from it.
However, when i go into system preferences>startup disk, OSX does not show my mounted OSX install disk listed as an option. Also, when I hold down C on startup, my machine ignores the command. And when I hold down the Option key on startup, the only startup option shown is my boot drive, not my OSX install disk.
I've tried zapping my p-ram. I've tried booting up in safe mode and then re-trying the above.
I don't know what else I can do, short of typing in scary UNIX command lines.
I'm going completely mental here. Please help me, somebody.
If it makes any difference, I've got gobs of apps installed, notably Adobe CS3, Final Cut Studio, Firefox, MS Office 2004.

Not that this solves the booting problem, but I recommend installing AppleJack, which is free (and does run on Intel). This provides easy commands for doing a disk check in single user mode (it's the same in the end as typing the Unix commands but much easier to use), and it's much faster than booting from the CD (even if you can).
Having installed it, restart holding command-S: after a lot of text you will get the line 'Type Applejack at the prompt' - you simply do this and then it's just a question of typing 'd' to check the disk and so on. (Incidentally do not run it from the Terminal when booted normally: you must use it only in single-user mode.)

Pismo won't boot from install disks

Hi! I've looked to find the answer elsewhere, but no luck... apologies if this has already been answered.
I have a Powerbook G3 Pismo which I now need to use to run Hypercard. (Yes!)
It has been sitting unused for over a year.
It didn't start up.
I found an article that explained how to remove the PRAM battery. I did so. It starts up fine when connected to power.
I have ordered a new PRAM battery, but it hasn't arrived yet. I decided to go ahead and try to get it to boot.
When I powered up, I got the alternating icon saying it couldn't find an installed system.
I guessed that the hard drive had become corrupt, so I rebooted into Target Disk mode. It worked!
I connected it via FireWire to a MacBook Pro. The Pismo did show up as an external firewire hard drive. Good!
Using OS X Disk Utility, I erased the Pismo drive.
I couldn't decide whether to use OS X Extended, or OS X Extended (Journaled).
I didn't know about any options to install drivers for OS 9, so I probably did the wrong thing. (Pismo can boot into either OS 9 or OS X, I think.)
I tried to fix this later (see below).
I disconnected the Firewire and shut down.
I finally got the Pismo to boot up from a MacWarrior CD (a 3rd-party disk utility that fixes directory problems). I used it to fix the directory.
It still wouldn't boot from the original disks that came with the Pismo. The optical reader whirred away, I got a blank gray screen, it whirred again, I got another blank gray screen, but the cursor never showed up in the upper left corner. After half an hour, it had made no progress.
I reconnected the Pismo to the Macbook Pro using Firewire.
I tried to install Tiger on the Pismo using my officially purchased, large-box Tiger software. The Macbook Pro mounted the disk, but when I ran the installer, it told me I couldn't install Tiger on this machine (the Macbook Pro, duh!) and only gave me the option to quit.I thought that I could use an all-model install disk to install OS X on ANY external hard drive! What gives???!???
I tried to boot from the AppleCare Protection Plan's TechTool Deluxe.
It seemed to be booting fine into 9.1. Yippee!
It halted with a System Error (address error) telling me to restart holding down the Shift key.
I do so. It seemed to be booting fine into 9.1 again, Extensions Off.
But it halted with the same System Error.
I read about OS 9 drivers and went back into Disk Utility using the Macbook Pro.
Using Firewire to access my Pismo hard drive, I re-erased everything and made the partition have an Apple Partition Map.
I did not see any option to check or uncheck that mentioned installing OS 9 drivers. Did I miss it? Was it not there because I'm using a recent version of Disk Utility?
Same problems. Can't boot from the original Pismo "Software Restore" or "Software Install" disks, nor the TechTool Deluxe...
VERY FRUSTRATING! Have I tried everything? Has the hard drive gone bad?
Any help would be appreciated.

My new PRAM battery has been installed. I reset PRAM by doing a command-option-P-R.
The problem remains, but it's getting more consistent, which I guess is progress. With the Pismo connected to AC power (all my batteries are, of course, dead by now), the following has happened:
When I start up with the Tiger installation disk, everything goes smoothly, the gray Apple logo appears, and then, suddenly, a flurry of white text on an irregular black background floods the screen. Darwin says there's a kernel panic and they're in a loop ("we are hanging here").
When I start up with the original Software Restore disk, the blank gray screen blinks, turns a different shade of gray, the cursor arrow shows up in the upper left-hand corner, and it hangs. The cursor arrow doesn't respond to the trackpad; it's frozen.
When I start with the original Software Install disk, the same sequence takes place, but there is no cursor arrow that shows up. It just has the gray screen, a blink with a slightly different shade of gray, then it hangs.
The behavior is exactly the same for all 3 disks (respectively) when I use the MacBook Pro to start up:
Insert Pismo or Tiger disk into MacBook Pro (counterintuitively).
Start up the Pro in Target mode. Connect to Pismo using Firewire cable.
Start up Pismo. Pismo takes awhile to notice the Firewire disk, but eventually does.
Then it tries to use the disk in the Pro, but ends up acting case-by-case as it did when each disk was in the Pismo's drive (kernel panic hanging, gray screen with arrow, gray screen without arrow).
Helllllp!
My last chance will be to take a hard drive from a defunct ice iBook (dual USB) and use it to replace the factory-supplied Pismo drive. That iBook was a G4; the Pismo is a G3 (I believe). If there has developed a deep, difficult problem with the Pismo's hard drive, hopefully this will solve it:
I will try to boot from the iBook-drive-in-the-Pismo. I doubt this will work. If it does, great! If not...
I will try to boot from the Tiger installation disk, and if that works, try to install the Tiger software on it.
If that doesn't work, I will try to boot from the Software Restore and the Software Install disks.
If that doesn't work, I give up!!!! Unless someone here has a better idea.

Can't get past language selection with Leopard Install disk

My 1 year old Intel Mac Mini, which had been running 10.5.4 without problems suddenly froze up. The mouse was still active but I couldn't click anything. I turned the system off with the power button. When I restarted it got as far as the login screen, but clicking the user didn't do anything. I was able to log in using safe mode (hold down shift when starting). I ran the disc utility, repaired permissions and verified the disc. Seemed OK, but still the same behavior (freeze at login screen) when I try to boot normally.
I tried booting from the Leopard install disk. When it reached the language selection page there were some strange-looking horizontal lines in the display. Clicking the "proceed" button caused a copy of the button's graphic to appear at the top of the page and nothing else happened. Very puzzling, since I had upgraded OS X using that same disc.
I have a Superduper backup from a couple of weeks ago. It won't boot up normally either. Any ideas? Unfortunately, I'm 2 weeks out of warranty!
Thanks,
jwstex

I would probably start looking at the ram to see if it's worked loose or a board has gone bad (rare, but it happens).
Make sure no external drives or other unnecessary connections.
If the ram doesn't fix the problem, then you could also Zap the PRAM by holding down the Command + Option + P + R keys during boot up. Hold down the keys until the Mac goes through 3 startup chimes, then just release the keys and continue to boot normally. Check your clock settings if it boots.
http://support.apple.com/kb/HT1379

OS 10.4 install disk freezes on mounting

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