Failed Leopard installation, now just show apple logo over white screen.

I just received OS X Leopard (not the new one, I'll buy it tomorrow) in order to upgrade to the new OS X snow Leopard. During the installation (took over 30 minutes to calculate the installation time that it was supposed to be 2 hr 49 min, I don't know if that's the average installation time). After about an hour of installation appeard a big yellow triangle (warning) over a message box saying something like "Installer couldn't verify 'Essentials' on the DVD, please contact the software manofacturer or try to install later". After restart the iMac it never rebooted, just shows the apple logo with the spinning circle, I left it that way last night while I was searching on the net for some help and iMac kept doing the same over 24hrs (apple logo over white screen). After reading on the forums I reboot with command+s and these are the two messages that are coming once and again in an endless loop:
First Message:
Aug 29 01:46:56 tony-guerreros-computer com.apple.launchd[1](com.apple.KernelEventAgent[2228]: posix_spawnp("/usr/sbin/KernelEventAgent", ...): No such file or directory
Second Message:
Aug 29 01:46:56 tony-guerreros-computer com.apple.launchd[1](com.apple.usbmuxd[2229]: getpwnam("_usbmuxd") failed
The number [2228] goes to [2229] then [2230] to the fist msg again, then [2231] to the second msg,.... in an endless loop.
Before this I have never experienced any trouble with this iMac. I don't know what to do now because it doesn't reboot and I don't have any boot disk besides TechTool Deluxe.

"Ok. But once I got the replacement disk the iMac will boot with the installation disk even though it now stills "gone" and unable to boot by itself? I mean, the installation disk is a bootable disk by itself?"
Read what you wrote and clarify it. You got the replacement disk? Yes or no. Yes the installer disk is a bootable disk. How else did you try to install Leopard?

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I am trying to download snow leopard, but with around 46 mins to go, a message appears saying, my coup is going to restart,it does but with just the apple logo,and white screen, nothing else,can anybody help? jib.

i am trying to download snow leopard, but with around 46 mins to go, a message appears saying, my coup is going to restart,it does but with just the apple logo,and white screen, nothing else,can anybody help? jib.

I think we need more clarification.
What do you mean by "download"? Only updates are available as downloads, the System software has to be installed from a DVD.

After upgrade iphone3GS now just shows apple logo

after upgrading my iphone 3GS just shows apple logo and is frozen
please help.

Read: http://support.apple.com/kb/HT1808?viewlocale=en_US&locale=en_US
(I'm assuming the device was not jailbroken)

Plz help!!!!! i have iphone 3g and i have chose the option of reset to factory shipped settings ... but now it does not start .. it just shows apple logo thats it .... plz can anybody help me

plz help !!!! i have iphone 3g and i tried option to reset my phone to factory shiped settings ..... but now it does not start even .. it just shows apple logo again n again ..... after that i went to recovery mode as stated by apple support and did things as stated .... but then i got the message iphone cannot be restored due to some eror 1015.....can any one please help me .. i will be highly obliged ...

First try a Reset ( No Data will be Lost )
Press and hold the Sleep/Wake button and the Home button at the same time for at least Ten seconds... (But can take Longer)... until the Apple logo appears. Release the Buttons
If no joy... Try a Restore...
1: Connect the device to Your computer and open iTunes.
2: If the device appears in iTunes, select and click Restore on the Summary pane.
3: If the device doesn't appear in iTunes, try using the Steps in this article to force the device into Recovery Mode.
From Here
http://support.apple.com/kb/TS3281
Make sure you have the Latest Version of iTunes (v11) Installed on your computer
iTunes free download from www.itunes.com/download
Note on Recovery Mode.
You may need to try this More than Once... Be sure to Follow ALL the Steps...
Once you have Recovered your Device...
Re-Sync your Content or Restore from the most Recent Backup...
Restore from Backup > http://support.apple.com/kb/ht1766
Note:
Also consider Deleting any Apps you have Purchased / Downloaded but you now never use...

Error 3194 still presist while restoring ipod touch 4g, just shows apple logo and wont start

Method 1: i have tried almost everything, 'hosts' file editing (adding and deleting that ip gs.apple.com thing)
Method 2: redsnow, snowbreeze,ireb (custom ispw and fetching thing)...
now my ipod is in dead case, it just gives apple logo and wont start.
Method 3: TS 3.0 and 1.0 checked, certificate xyz... uncheked from intertnet explorer-> internet option -> advanced -> security
Method 4: netsh xyz (comand) in cmd...
Please Help thank you.
"Details:
ipod touch 4g
ios 6.1 installed (lastly)
jail broken but deleted cydia from it
then tried to restore it always gave Error 3194,
then restored it from its backup file after that it didnt opened or just showed apple logo thats it."
my itunes on dignostic gives this report,
Microsoft Windows 7 Business Edition Service Pack 1 (Build 7601)
Hewlett-Packard HP xw4400 Workstation
iTunes 11.1.1.11
QuickTime not available
FairPlay 2.5.16
Apple Application Support 2.3.6
iPod Updater Library 11.1f5
CD Driver 2.2.3.0
CD Driver DLL 2.1.3.1
Apple Mobile Device 7.0.0.117
Apple Mobile Device Driver 1.64.0.0
Bonjour 3.0.0.10 (333.10)
Gracenote SDK 1.9.6.502
Gracenote MusicID 1.9.6.115
Gracenote Submit 1.9.6.143
Gracenote DSP 1.9.6.45
iTunes Serial Number 001AB71808E6CBD8
Current user is not an administrator.
The current local date and time is 2013-11-29 04:19:21.
iTunes is not running in safe mode.
WebKit accelerated compositing is enabled.
HDCP is not supported.
Core Media is supported.
Video Display Information
NVIDIA, NVIDIA GeForce 8400
**** External Plug-ins Information ****
No external plug-ins installed.
iPodService 11.1.1.11 is currently running.
iTunesHelper 11.1.1.11 is currently running.
Apple Mobile Device service 3.3.0.0 is currently running.
**** Network Connectivity Tests ****
Network Adapter Information
Adapter Name:    {BC8F9388-D244-4F12-92A3-A26318EE6C52}
Description:    Broadcom NetXtreme Gigabit Ethernet
IP Address:    192.168.1.102
Subnet Mask:    255.255.255.0
Default Gateway:    192.168.1.1
DHCP Enabled:    Yes
DHCP Server:    192.168.1.1
Lease Obtained:    Fri Nov 29 04:16:55 2013
Lease Expires:    Fri Nov 29 06:16:55 2013
DNS Servers:    192.168.1.1
Active Connection:    LAN Connection
Connected:    Yes
Online:        Yes
Using Modem:    No
Using LAN:    Yes
Using Proxy:    No
Firewall Information
Windows Firewall is off.
Connection attempt to Apple web site was successful.
Connection attempt to browsing iTunes Store was successful.
Connection attempt to purchasing from iTunes Store was successful.
Connection attempt to iPhone activation server was successful.
Connection attempt to firmware update server was unsuccessful.
The network connection timed out.
Connection attempt to Gracenote server was successful.
Last successful iTunes Store access was 2013-11-29 04:18:45.

lllaass thank u bro, but none worked for me
i have tried all these methods n above which i mentioned before....
- Powering off and then back on your router.
- iTunes for Windows: iTunes cannot contact the iPhone, iPad, or iPod software update server
- Change the DNS to either Google's or Open DNS servers
Public DNS — Google Developers
OpenDNS IP Addresses
- For one user uninstalling/reinstalling iTunes resolved the problem
- Try on another computer/network
- Wait if it is an Apple problem
in the end i went ot market n paid him 1.94$ and he restored it to 6.1.5... and said apple has closed other ios updation except 6.1.5 ...but still thank u soo much learned some new stuff from u...

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was updating my iphone 5 s and now is showing apple logo in itunes

Not clear just what you are seeing - does the iPhone screen show the USB cable pointing to iTunes? If that is what you are seeing then it has entered the recovery mode and has to be restored by following the instructions in http://support.apple.com/kb/HT1808

HT201210 how to resolve error 21? my iphone 4 just showing apple logo... when i'm trying to restore it... it is showing error 21 n that's not letting me restore it :( pls help

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From the article that the question was posted from:
Error 1611
This error typically occur when security software interferes with the restore and update process. Follow Troubleshooting security software issues to resolve this issue. In rare cases, this error may be a hardware issue. If the errors persist on another computer, the device may need service.
Try reading the solutions you find in the future and follow them.

I resets my iphone without disabling touch ID lock, it restarts, apple logo appears, and it stays like that, it never starts till now, just the apple logo appears and stays that way, please give a solution???

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Hi ahmedsgh,
I'm sorry to hear you are having issues with your iPhone. If it isn't responding or starting up past the Apple logo screen, you may find the troubleshooting steps outlined in the following article helpful, in particular this portion:
If your device gets stuck during startup
When starting up, you might see the Apple logo or a red or blue screen for a long time, or your device might restart again. Try these steps:
Make sure that you have iTunes 12 or later on your computer.
Put your device in recovery mode.
When you get the option to restore or update, select Update. This will reinstall iOS without erasing your data.
If your iPhone, iPad, or iPod touch doesn't respond or doesn't turn on - Apple Support
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Have you tried doing a DFU restore? Here's how: http://appletoolbox.com/2010/07/using-dfu-restore-to-solve-iphone-problems/

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Failed Leopard Installation, now Tiger wont boot

I recently tried to install Leopard onto my MacBook and during installation an error message came up talking about running a preupgrade script and it told me to contact tech support. so i tried to quit the installation and reboot normally but when I clicked on Quit Installation the spinning pinwheel came up and stayed like that for over an hour. So I restarted with the power button.
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Scott,
thank you so much for your help. but looks like it is my HD afterall ):
...somehow leopard installation revealed a "boot" problem....or created it?
as an alternative to getting the install disc in: Applecare told me to hold option key down after turning on the mac, mac HD symbol did appear so then I could insert the install disc, selected it and went to disk utilities:
He suggested I partition the drive first, to repartition it back together later, before trying a last resort of zeroing the drive which would take a long time.
When partitioning failed because it said "resource busy" and then first attempt to erase HD selecting the one with numbers failed with the same "resource busy" 3rd attempt to erase Mac HD did work.
however this tier 2 applecore person was concerned that even if I zeroed the drive there was something wrong with my "boot" and then after confirming with me I didn't have boot camp installed, told me my Macbook pro needed to be sent in for the HD to be replaced.
since having enough GB is my main problem (with final cut installed) I have a related question:
To add GB with a new HD? since mine is only a 100 GB?
I was told authorized apple dealer can do this (but not apple) and applecare will still cover me (except for the bigger HD itself)
do you think it advisable to go for more GB?
for the next 2 months, I need my macbookpro for work so I am tempted to let apple replace this 100gb HD and do it later when I am going on vacation
Also JUST TO BE ABSOLUTELY SURE this leopard works and there aren't any other problems with my laptop and apple can't blame me and my buying a new bigger HD...
(: silver lining is that now apple will install leopard for me! yeah I think!
do I want this leopard afterall? or wait for a cheta or whatever is next!
thanks again!

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Hello, Harshilg.
Thank you for the question. You may find this article helpful in troubleshooting your issue.
iOS: Not responding or does not turn on
http://support.apple.com/kb/TS3281
If the issue persists, see step 6 of the article.
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OK so need a bit of help here
My iphone just keeps showing the apple logo and timer
I have tried to restore it a number of times and it just goes back to the same thing. It also wont let me restore it from the back up and have to do it as a new phone been like this for a week.
Any ideas what else i can try
Oh dont know if this is important but the logo doesnt go dull even when i leave the phone only turns of after the battery has died.
Thanks

Next step, try DFU Mode Restore.
Connect iPhone with USB cable to iTunes. Hold both Home and Power buttons for exactly 10 seconds, then let go of Power button, keep holding Home button until iTune detects iPhone in Recovery Mode, usually this take less than another 20 seconds. If the iPhone screen is black, this is DFU Mode. If anything is on the screen this is not DFU Mode. Keep trying the above process until you get DFU Mode (which is Recovery Mode with Black Screen). Then Restore the iPhone Firmware.

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The following support article is somewhat outdated. Where it refers to booting from an installation disc, you should boot from your recovery partition (if running 10.7 or later) by holding down the key combination command-R at the chime. If your startup volume is encrypted with FileVault, you’ll have to unlock it in Disk Utility before you can do anything with it.
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http://support.apple.com/kb/ht1551
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Failed Leopard installation, now just show apple logo over white screen.

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