Powerbook G4 Wont Start

My PB G4 wont startup. Tuttle on the G4 message board suggested I post here to see about some help. Disk Utility found nothing wrong, same with Hardware scan. I even reinstalled the OS 10.4.2 with no effect. The computer stalls at startup on the grey screen w/the apple and will go no further. Sadly that didn't do it.
The suggestion to perform the safe startup didn't work at all. It remained the same as ever: a blank grey screen. I waited for several minutes, then shut down and tried again.
When I started up in single user mode I was given a screen which was filled with "failed to load exrension com.apple.driver.AppleMacRiscPCI" with alot of junk in between.
It wouldn't let me enter any commands, at the end it repeats: "still waiting for root device"
HELP!! Uh-oh...
Thanks again,
Antonio

Let's start over.
10.3.9 was pre-installed and shipped with your Mac when purchased along with a 10.4 Upgrade install package?
Were you experiencing any problems with 10.3.9 prior to installing the 10.4 Upgrade?
You indicated that you re-installed 10.4.2. Was this the 10.4.2 Delta or Combo Update?
Do you maintain a backup of your hard drive data and if so, do you have a recent update?
The reason I ask, this may require re-initializing the hard drive or performing an Erase & Install (which erases the hard drive) using the 10.3.x install package that shipped with your Mac and then re-installing 10.4.

Similar Messages

HELP!!! My powerbook g4 wont start up.

HELP!!! My powerbook g4 wont start up. when i press the start button, i hear the start up chime, the screen turn grey with the apple log on it, then the wheel rotates like 3 times and stops but the main screen doesnt come up. sometimes the wheel just rotates continously and nothing happens@

Boot your computer using the install disk (hold the C button while turning on the computer, with the install disk inside). Open Disk Utility and repair the disk and disk permissions.

Powerbook g4 wont start up

Went to turn on my 15inch powerbook g4 and it was just sitting at the blue screen. then after a minute it flashed black and the screen came back on with a blue screen and a picture of a folder with a flashing question mark and the finder icon.
I inserted my diskwarrior cd to try and fix the problem. Restarted the cpu and held down c button. Nothing happened. just the same folder with the ?
i have tried everything at startup.
Holding down all the different buttons i have read about.
I want to try and restart with the osx install discs but i cant get the diskwarrior cd out.
I have tried holding down the eject button
tried holding down the trackpad button at start up even tried to type in eject-disc in firmware. nothing will get the cd out.
Any suggestions so i can try and boot up with osx install disk?
Also everything worked fine the day before i.e. disc drive and hard drive
Thanks

HI,
back on with a blue screen and a picture of a folder with a flashing question mark and the finder icon.
Flashing question mark on boot indicates your Mac can't find a System Folder to boot from. Try booting while holding down the Option key which should prompt the Startup Manager window. You can then select the startup disk. If the PBook boots to the Desktop, move the DiskWarrior icon to the Trash. Hopefully that will eject that disk.
At this point, definitely boot from your install disc, run Disk Utility in case the startup disk needs repairs.
Insert your install disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
*(Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)*
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
When you are finished with DU, from the Menu Bar, select Utilities/Startup Manager.
Select your start up disk and click Restart
While you have the Disk Utility window open, look at the bottom of the window. Where you see Capacity and Available. *Make sure there is always 10% to 15% free disk space*
If you can't boot from your install disc, try booting in Safe Mode
You can verify the startup disk in Safe Mode, but not repair. Also, if you can't boot from your install disc, booting in Safe Mode you may be able to eject the DW disc.
Carolyn

Powerbook wont start up

today after installing some software, my 15inch powerbook G4 wont start up. i get the grey apple screen, then the blue progess bar flashes up for a split second then it gets stuck on a solid blue screen.
so far i've tried repairing disk, repairing disk permissions, resetting the PRAM and resetting open firmware none have worked
anyone have any ideas that will save my having to completely reinstall os x?

FrontRow--Hmmm.
Any chance you tried the Intel version rather than the PPC?
Joe

Help my powerbook wont start

Im having trouble starting my powerbook. When I turn on the computer first I see a folder with the question mark, then a grey screen with a black square in the middle saying that i need to restart my computer. I know its a Kernel panic. I tried to use the disk utility to repair it. It repairs but it still wont start up. I tried re-installing the software and it cant find a drive to install it. I try to turn it on in safe mode and a bunch of information about the kernel appears and at the end it says "panic: We are hanging here. . ." So i dont know what to do. Can someone help me please. Thank you so much.

It could be your ram. Inspect that is in place properly.

HELP! Powerbook wont start up

Please can someone help me?
My G4 Powerbook will not start up.
After reading the troubleshooting part of the manual I put in installation disc 1 and tried a disc repair and it came back with
"Invalid B-tree node size
volume check failed
The volume needs to be repaired"
Even if I try to follow the installation process there is no destination shown in the window of the installer.
Have I lost everything? Please can some body tell me what I need to do?

When I tried repair disc I got
Invalid B-tree node size
Volume check failed
When I tried verify disc I got
The volume needs to be repaired
First aid failed - No valid packages
This is the first problem I've ever had with my mac after 3 and a half years and unfortunately all my current work and photos are on there and they are not backed up!
I have ordered a copy of discwarrior so I'll see how I go. I hope it's straight forward to use as I'm no techy!
Thanks for your help
thanks
PS Could you possibly tell me how I could eject the installation disc as it does not respond to the eject button and the icon is not available on the repair/verify disc window?
Message was edited by: Karen Stone
Message was edited by: Karen Stone

My powerbook g4 wont boot

Hello today i need to ask some people why my powerbook g4 wont boot it goes all the way to the blue screen and then it has the spinning lines than it goes to the mouse cursur and just stays there. I trien reseting pmu, pram, nvram but nothing happens i have the mac disk but when i put it in and hold c when i start it just has a blank white screen and it pops the cd out. i tried open firmware way by typing boot cd:,
:bixs but it just sais open Atapi-diak cant read disk label cant open cd:,
:bixs. i tried startup manager but the disk isnt there and my mac hd is in the startup manager but has a little x in the picture what does that mean. So anyone there can some one help me
Xhevat.G
just an ordinary mac user

Disconnect all peripherals from your computer.
Press the Power Button and immediately press and hold down the Command and the S keys as the machine starts up. This boots you into Single-user mode and you should see white text appear on the screen.
When you see the # Command prompt, type /sbin/fsck-fy and hit the Return.
Now sit back & let your computer do its thing. This should take approximately 15 minutes or so. Depending on how messed up your computer is. Just be patient.
If and when you see the message File System was modified repeat the steps above again & again until you hopefully see the message "no problems were found." When that happens type reboot and hit Return again.
If these steps do not work then boot from your install disc to repair disk. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
Select your language.
Once on the desktop, select Utility in the menu bar.
Select Disk Utility.
Select the disk or volume in the list of disks and volumes, and then click First Aid.
Click Repair Disk.

Help, iTunes wont start

I was using iTunes this morning and it was working fine. I get back this afternoon and when I click on the iTunes logo in my dock, it jumps one time, the arrow appears under it, then the arrows go away and the icon stops jumping. That's it, no error message, no nothing. I attempted to rectify the situation by uninstalling iTunes, then re-downloading it from Apple and installing it. I installed it ok, went to open it and it did the same thing. I moved my iTunes Library, thinking there might be something wrong in there, and it still wont start up. This is the first problem I have had of any kind since I've had this Powerbook, it'll be a year this October. Can anyone help?
Powerbook G4, 15in 1.67 GHz Mac OS X (10.4.6)

Try these steps
But I would start with the standalone quicktime install step within the link below, before you try everything else. Make sure to disable antivirus when installing...
http://docs.info.apple.com/article.html?artnum=93976

Wallstreet wont start

I changed the original 2Gb drive for a 20GB (it would not accept a 40GB one) and installed OSX 2.8( I think) partitioning the drive... well with OSX it simply doesn't work...it wont start.... with 9.2.2 it works ok, not perfect because I have to keep it on sleep mode overnight because if not next morning it takes (or not) a few attempts to start... the question is... how can I change the startup OS (from X to 9) I tried with a CD OS 9 and it wont recognize it i.e. nothing happens!!!
without the CD the chime goes on, but sometimes the screen lights up and 9 starts, then chimes again and OSX fails to start... (what does the chime exactly mean?)
any help would be appreciated
Alex

Alex,
The Wallstreet certainly has its problems with OSX. However, once set up properly, it can be quite useful running OSX.
If you don't mind, I want to ask a lot of questions regarding your Wallstreet and system software to help solve your problems.
- The startup chime means the powerbook has successfully initialized various components and completed its startup hardware test. Do NOT rush the startup at this point; the powerbook then performs a memory test and with 384MB of installed RAM, you will not see any activity for 30-40 seconds, then the display lights up and the 'book looks for a bootable volume. This may be what you are experiencing when you say it takes several attempts to start.
I AM TOTALLY AWARE OF THIS, THE TIME NECESSARY UP TO A MINUTE OR MORE FOR VIDEO TO APPEAR...
- Do you have a charged main battery in the Wallstreet? If not, do you always keep the power adapter connected?
I HAVE BUT I REMOVE FROM TIME TO TIME, I TRIED BOTH WAYS
- When you try to start the Wallstreet from a cold start ("it takes (or not) a few attempts to start"), what exactly is happening? Do you hear a buzzing when you press the power button? (Similar to earlier question.)
TODAY, AFTER SEVERAL FAILED ATTEMPTS, IT STARTED FINE, OSX RUNNING, SWITCHED TO OS9, RESTARTED, SWITCHED TO OSX, AFTER A WHILE RESTARTED ON OS9...TURNED IT OFF. WHEN I WANTED TO RESTART IT, IT NEVER DID
- What version MacOS 9 CD do you have? Does it have a white background with a big orange '9' on it? Can you boot to the 9.x CD?
- Do you have the MacOS X 10.2 Jaguar CD?
- When updating to 10.2.8, are you sure you installed the correct Combo Update? There is a Server version you should not use.
http://docs.info.apple.com/article.html?artnum=120244
- If in fact you installed/updated 10.2.8 using a different procedure, please describe.
- If you can boot to your installed 9.2.2, have you tried selecting OSX in the Startup Disk control panel, then restarting? (The power manager reset below will help this problem if the PRAM is corrupted since this procedure also resets the PRAM on the Wallstreet.)
- If you successfully boot to OSX, use the Startup Disk panel in the System Preferences to restart to 9.2.2.
At this point, I would reset the power manager from a cold start, then see what OS it starts up to, if any. After the reset, boot to your 9.x CD, although if you do not have the correct CD, it will not boot. Your Wallstreet requires the keyboard (4 keys) reset procedure. This reset may also allow booting to your 9.x CD and then you can select OS 9.2.2 on your HD as your startup volume.
http://docs.info.apple.com/article.html?artnum=14449
I HAVE ALWAYS USED THIS (4 KEYS) RESET PROCEDURE...AND ONCE IN AWHILE IT WILL START...
I TRIED WITH OR WITHOUT THE HDD, AND IT DOESNTMAKE A DIFFERENCE...AT THIS POINT I THINK IT MIGHT BE THE PROCESSOR..
UNFORTUNATELY I DO NOT HAVE ONE HANDY TO SWITCH IT AND TRY THAT....OR COULD IT BE THE POWER MANAGER????
FOR A FEW MONTHS, BEFORE I REPLACED THE HDD IT WAS, ONCE IN A WHILE, HAVING TROUBLE STARTING... AFTER THE (4 KEYS) RESET PROCEDURE, IT ALWAYS STARTED, BUT APPARENTLY IT IS NO LONGER...
THE FUNNY THING IS THAT WHEN IT WORKS, IT WORKS FINE, BUT SOMETIMES IT STARTS AND IS SLOW...SO I DONT THINK ITS HAS ANY CONNECTION TO THE OS X OR OS9 (I HAVE BEEN USING 9 FOR 3YEARS)
DOES ANY OF THIS MAKE SENSE?
THANKS ALEX

IBook G3 wont start...nothing happens...Please help!

Hiya Everyone,
My iBook G3 wont start-up. It was fine yesterday but today when i turned tried to turn it on it was completely unresponsive.
When presing the power button nothing happens, no hard drive spin up, no noises...nothing.
This ever happened to anyone before?
All help greatly appreciated.
Daniel.

I'm sorry, Dean, but the Geniuses were correct. The iBook Logic Board Repair Extension Program is not a recall in the truest sense of the word, and only covers the specific logic board problem dealing with video. It has never covered any and all logic board problems.
Enjoy that new MacBook!
If you want to sell the non-working iBook, PowerBook Tech buys them and parts them out. You may want to check them out.

Satellite A660 wont start again until i turn to safe mode

Just purchase toshiba Satellite A660: i tell the story to compensate closely to my answer, hopefully ..
I just purchase it new, run the insallation program for first use. When its up and running just within that day i noticed that it start to hang up when i hooked external drive for some program installation (adobe lightroom).
Its still fine but when i turn it off, it wont start again until i did turn to safe mode so that i could back up some of the files and run the recovery again.
This time on 64bit. When its finish its process, it works well for just a couple of hours.
It fell faster now thou, maybe because its on 64bit? ( any recommendation whether its 32 or 64bit) specs: i5 , 4ram, 1g ddcatd graphics , win7 home premium, ..
Now, when i turn it off it never start back again windows say.. start up repair. ..
I did let it run since this morning until now still they cant find whats the problem (i'm refering the loptop) .
So any idea on whats goin ?

> It fell faster now thou, maybe because its on 64bit? ( any recommendation whether its 32 or 64bit) specs: i5 , 4ram, 1g ddcatd graphics , win7 home premium, ..
64bit Operating system is better if your notebook supports 4GB or more RAM.
Why? Because Win 32bit recognizes max 3.2GB even if more RAM is available.
This is 32bit limitation; no matter what OS it is; Linux, Win XP, Vista, Win7 etc
This is the reason why 64bit OS are so popular in the last time
Regarding the OS issue;
I recommend running a HDD recovery again... this means you should reinstall the OS usign the Toshiba recovery option;
Press F8 while powering up the notebook, Choose Repair my Computer, -> HDD recovery

After Effects just bounces in the dock but wont start

Hi all,
Just installed CS4 production studio under Snow Leopard. All works well and updated using the Adobe Updater. All apps are fine except AE which just bounces in the dock a few times and then stops. I read that this could be because Rosetta was not installed. I installed Rosetta from the Snow Leopard DVD and still nothing. Have restarted 3 times just in case (I also read that several restarts may be required to get it to work), but still nothing.
Any help would be greatly appreciated.
Regards
Dave

OK... Now I feel like Scott of the Antartic writing in his journal before the inevitable... I am writing this purely to help anyone else with the same issue to resolve it without the pain that I am still experiencing. Hopefully the last entry will read "all solved" and not "I am about to pop outside... I may be some time..."
After using CS2 for the bulk of my work I thought I'd try and get this solved once and for all, especially as we have a DVCPROHD project coming up and need CS4 to do it.
OK... The so now I have the suite running, except Premiere is running under at trial without the presets and the updates fail when installing. Contacted support this week, they wont re-open the original case because it has been over a month. Fair enough, new case.
The adobe guy takes control of my machine, deactivates it, then from Finder deletes lots of folders. He then asks me to re-install the products. I do this (2 hours later) and run Premiere and it appears to work with presets. I look a bit closer and notice that under the help menu of Premiere Register, Deactivate and Updates are all greyed out. This is not the case in the other products of the suite. OK, so not a major deal but does imply something is not installed right. I run the Adobe Updater, Premiere updates, but AE, PS and several updates fail.
Call back to support. This time the Adobe guy takes control of my machine suggests I deactivate the suite, run the un-install and then download and run the CS3 Clean script and re-install. I do all this. Another 2 hours later feeding discs into the machine... and... Premiere looks fine, presets all there... but wait for it... AFTER EFFECTS JUST BOUNCES IN THE DOCK BUT WONT START.
3rd call back to support and ask for the issue to be escalated. This is difficult and I have to cause a fuss to realise that this problem is the same one that has been hanging around for months and that I am not prepared to spend more hours removing every trace of Adobe from my machine and re-installing - this doesn't work. The support technician asks me to delete a hidden folder that has all the Adobe patches in it, manually download the AE 9.0.2 update and install it. It installs but AE wont start. I explain that I've had enough and want the problem escalated.
I finally get a call back from a 2nd level engineer this morning. After explaining the that AE wont start and then answering the question "why is this a problem for you!" we do some quick troubleshooting. This time I have to pull out the network cable, turn off Airport, create a new user account, log on to it and then see if AE runs. Which it does. Within seconds we get launched into the pre-determined script, "if it runs under another user account then there is nothing wrong with the applications and I should call Apple". After being patronised for a further 5 mins I had to PROVE to the guy that it was also possible that the fault was Adobes. I also know the moment I phone Apple, the response will be "Call Adobe".
The only example I could give him at the time was to image a piece of software I had written that allocated memory based on the screen resolution (this is a user preference) and if my code was badly written and crashed when encountering a screen resolution bigger than my code was expecting. OK, is that Apple's fault, no it is my code. Will it run under one user and not another, yes it will. There are a million other posibilities. Some I agree could be Apple's, but equally some could be Adobes and the big fat fob off as soon as you can is terrible.
I have also since realised since leaving this call with the technician, that:
1) This is a brand new iMac and the Adobe Suite was the 1st piece of 3rd party software installed on it.
2) The iMac is for video editing and nothing else.
3) This was working without presets before the Adobe guys deleted all these files and asked me to re-install. It is more likely that they have deleted something they should not have rather than the a bug in the OS. A bug in the OS is still possible but I suspect the problem is with a rogue bit of installation code from Adobe.
Finally incase anyone from Adobe is reading this:
I have paid thousands of pounds for this software.
I have been unable to use it for months.
A problem like this should be gold dust for you. Here is the chance to get to the bottom of an issue that several people are having, understand the mechanics of what is going wrong. Write a KB article as well as a patch and this would save the time/money and effort of an awful lot of people (including your own).
As a short thought experiment I would like everyone at Adobe to image the following:
You pay £1,000 of your own money for a tool to do your work on the promise that you can make this money back in productivity gains, new business, etc.
The tool you use every day to make a living won't work. For the benefit of the experiment, imagine this is your email client, web browser or case management tool.
You have no IT group to replace your machine or to come and solve it.
You can't tell your customers that your software is down and you have to keep doing your job.
You have to spend an additional 3 days in your own time, working late or weekends to try and fix the software yourself.
You to keep downloading a Gigabyte of data 3 or four times and you have to pay for downloads. Currently you are running up a bill of over £100 in downloads and phone calls.
You don't get paid the overtime and your customers start complaining you are late with your work.
You lose customers... you eventually get fired because you have lost too many of them.
...This is what it feels like for a small creative business to not be able to install the software they bought.

WONT START AT ALL

Dear all, this is frustrating. The system just wont start up, chimes and spins around but just goes up to the apple logo and that is it. I leftit in sleep mode all night by mistake and the following day refused to start. Any ideas pls? I've done all the suggestions to reset the pram/ram.

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since your last backup, you can skip this step.
There are several ways to back up a Mac that is unable to boot. You need an external hard drive to hold the backup data.
a. Boot into the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.”
b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
c. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
Step 3
Boot in safe mode. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you boot in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, your boot volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 5.
If you can boot and log in now, empty the Trash, and then open the Finder Info window on your boot volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then reboot as usual (i.e., not in safe mode.)
If the boot process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 4
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 5
Launch Disk Utility in Recovery mode (see Step 1.) Select your startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then reboot as usual.
Step 6
Reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 7
Repeat Step 6, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a Time Machine or other backup.
Step 8
This step applies only to older Macs (not current models) that have a logic-board ("PRAM") battery. Both desktop and portable Macs used to have such a battery. The logic-board battery is separate from the main battery of a portable. A dead logic-board battery can cause a gray screen at boot. Typically the boot failure will be preceded by loss of the startup disk and system clock settings. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 9
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store to have the machine tested. If you can't get to an Apple Store, go to another authorized service provider.

Satellite U400-14B shuts itself off and now it wont start up

Hi
just got a new Satellite U400 this week.
Was working perfectly the first few days, then last night, it just shuts itself off and now it wont start up.
I press the on button and the row of lights next to it light up, but nothing happens I dont even get as far as the Toshiba screen.
I have tried many things. I left it plugged in overnight, tried taking the battery out and no result as of now.
The little led lights on the bottom indicate that there its plugged in, the battery is white not orange, when pressed they all light up again only for a split second.
The only thing I can liken this too is when a car wont start and you keep turning and turning the key, well in this case pushing a button, and nothing happens, the fans dont whir or anything...
help please...

Has extra Memory (RAM) been installed? Try removing one Memory Module and try a different Memory Slot.
If bad memory is not the problem, then there is not much else you can do except send it to an ASP for warranty repairs.

Itunes wont start and i get no error messages

i just downloaded itunes 7.3 and itunes wont start any ideas how to fix?

Okay. I'm still wondering about your firewall. A "persistent" iTunes.exe in your processes is most consistent with a firewall blocking iTunes, iTunesHelper and/or QuickTime from accessing the Internet. (Norton Internet Security 2005 is by far the worst offender in this regard, but it can be produced both other firewalls too.)
Head into the Firewalls settings and make sure that iTunes, iTunesHelper, and QuickTime are all being allowed full access to the internet.
If iTunes still doesn't launch after making sure the firewall is correctly adjusted, reboot the PC and try the suggestion from the following document. (It's a much rarer issue, but it can also produce that persistent iTunes.exe symptom in conjunction with an error-message-free iTunes launch failure.)
iTunes for Windows doesn't open after upgrading

Powerbook G4 Wont Start

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