IMac G5 not starting up after system board install

Six caps blew on my old system board so I ordered a new one and installed it. The system started up great and was running perfectly. However, after the 3rd or 4th reboot, there is no longer anything on the display. I can hear the power click on and after a few seconds, the fans usually start to sing.
I have reset the SMU several times. I have taken the cover off and checked that LED #1 is on when I plug in the power cord. When I push the internal power button, LED #2 comes on and stays lit. Still there is no display.
Can anyone make a suggestion as to what I might check next or what might be going on?
I feel like maybe I didn't get everything plugged in securely when installing the system board, but it was working initially. Any ideas?

It is quite possible that your replaced board is faulty, or that the caps on the power supply have now gone bad. Check every cap in the machine and see what you find.

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If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

G4 iMac will not start normally

My wife's G4 iMac will not start normally. I have used the procedures from http://docs.info.apple.com/article.html?artnum=107393 and the "Disk Utility" on http://docs.info.apple.com/article.html?artnum=106214 to no avail.
When trying to start, a message comes up saying that the computer must be rebooted. Trying to boot in "Safe Mode" fails after an hour and shuts down the computer, and the "Disk Utility" runs for an hour or two and then gives a message that it was unable to repair the "minor error" on the hard-drive.
After force starting the iMac by holding the power button until the command line appears, I tried running fsck, but the commands are unrecognized. However, if I type in "mac-boot" at the command prompt, the iMac will start. I have copied all of my wife's photos, movies and music, and Word and Excel documents, etc. to my XP PC's hard-drive using USB flash drives.
My question is two-fold:
#1. I have heard that "Disc Warrior" is excellent at resolving hard-drive errors. Can anyone comment on "Disc Warrior" and is there anything else out there that someone can recommend?
#2. I bought RAM to bring the total up to one gig, so I was thinking of upgrading the hard-drive and installing Tiger on the new and larger drive while in the "Ball" changing the RAM. What is the maximum capacity hard-drive I can put into the G4 800mhz iMac without any problems and is there any particular model hard-drive that seems to work best?

I tried reading the link that you posted http://www.thexlab.com/faqs/kernelpanics.html but I don't have a disk with the "Apple Hardware Test".
Since I made the post that you replied to, things have gotten worse. I can no longer get onto the internal hard-drive. I have tried many different methods including the methods written about in the linked article you supplied. I can get onto the Installation CD and I can run "Disk Utility" from the CD. I have repaired the file permissions, but when I run "Repair Disk", it runs for about two hours and then suspends operations with a dialog box stating, "First Aid failed. Disk Utility stopped repairing Volume because the following error was encountered: The underlying task reported failure on exit." and then in the progress box after the list of addresses, there is a message:
(in red) Incorrect number of thread records
Invalid leaf record count
Invalid Map Node
Invalid directory Item Count
Invalid directory Item Count
Invalid volume directory Count
Invalid volume file Count
Volume Bit Map needs minor repair
Invalid volume free block count
Volume header needs minor repair
(in green) repairing volume
(in red) The volume could not be repaired
Error: The underlying task reported failure on exit
(in black) 1 HFS volume checked.
(in red) 1 volume could not be repaired because of an error
(in black) repair attempted on 1 volume
(in red) 1 volume could not be repaired.
I recently bought the 1/2gb replaceable RAM and the 1/2gb "Hidden" or "Factory Installed" RAM. I was planning on installing them soon. Since the "Disk Utility" is telling me that there are faults on the internal hard-drive and I have to go into the "Ball" to replace the "Hidden" or "Factory Installed" RAM, I figured that I might as well replace the hard-drive and redo the system.
Unless someone comes up with something I can do which will not cost me much money, I figure that I might as well install the RAM and a 120gb Western Digital Hard-drive that is about a year old, but was only used for a few days in an XP PC. Will the 120gb drive be recognized? I was thinking of partitioning it as 80gb and 40gb partitions. Does that sound good? I would install the OS on both partitions so that I could always boot if there was a failure.

My imac does not start anymore (stops at the screen with the apple and a rotating circle). An idea what I could try to make it start again?

My Imac does not start anymore.
==> What I have already done:
1) I tried with the tigger dvd to reinstall. It didn't succeed.
2) Via the single mode, when starting I got the message "disk0s2: I/0 error" several times. After that I got "Root device is mounted read-only"
3) Nevertheless, I tried the "fsck -yf" function. After checking "Journal HFS Plus volume", "extends overflow file", "catalog file"... and invalid record count
==> /dev/rdisk0s2 (hfs) EXITED WITH SIGNAL 8
Can someone advices me? I red on the internet I could reformat the disk... loosing all the data I didn't backed up. How am I suppose to reformat?
Thanks in advance,
Fred

Reset the SMC: http://support.apple.com/kb/HT3964
Reset the PRAM: http://docs.info.apple.com/article.html?path=Mac/10.6/en/26871.html
Restart the computer while holding down your mouse button which if you hold it down long enough (5 minutes at most) should eject the disk
If the disk still doesn't come out at that point then you need hardware evaluation;
contact Apple, contact an Apple Authorized Service Provider, or make an appointment with an Apple Retail Store.

My imac will not start - it is hunged up, when I turn it on I see the apple and the little wheel go around and around and nothing happens - what can I do ???

Hello - can anybody help me - my Imac will not start - When I try to start it I just get to see the apple and the wheel that goes around and around HELP !!

Restart in Safe Mode, this will clear some caches. How you do this is when you hear the startup tone hold down the Shift Key until you see the progress bar appear. Let it fully boot, then open System Preferences - Startup Disk and ensure your internal HD is selected and then click Restart to test. If you still don't have luck you should run Apple Hardware Test in Extended Mode, you may need to run the test 2-3 times to report any errors. To run AHT you will need teh ORIGINAL Install Discs that shipped with the computer. Instructions for AHT are in:
http://support.apple.com/kb/HT1509
Have you been backiing up?

2007 Mac Book pro Shuts down at startup attempt. Tried reloading OSX and will not start up after that.

My Mac Book Pro started having issues. I tried to relaod the operating system and it worked for a moment. When I tried to do a time machine back up it failed.
Now itr Shuts down at startup attempt. Tried reloading OSX and will not start up after that.

Dr.Conga,
did you try to do a Time Machine backup from your MacBook Pro, or a Time Machine restoration to it?
Are you trying to reload your current version of OS X (10.7.4, to judge from your signature), or are you trying to reload the version of Mac OS X that came on the grey installation DVDs that originally came with your MacBook Pro?

IMac G5 not starting up after system board install

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