Won't display after startup

My Mac mini didn't display after the grey startup screen so I took it to the store. They got it working. At home it didn't work. I called Apple. They troubleshot with me on the phone then said they'd get me a new one.
The new Mac mini started up fine and worked earlier today, even with restarts, but now it is not working.
After grey startup, I get a solid blue screen, with no mouse, no icons. This is what happened before.
My display is a ViewSonic professional. It's a GREAT monitor and I'd hate to give it up.

Get this. I'm having the same problem with my ViewSonic, the second time in about 10 days, except the problem is also present when I hook up a generic display I use on an old PC. When I plug in the generic display, it puts up a message stating something like both input signals are not working.
My fix was to use a new adapter plug for the monitor that shipped with my Mac G5 at work. I plugged it in and it fixed the problem, but now it's doing the same thing. I though perhaps the ViewSonic was overloading the adapter and frying it.
Ideas?

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Hi,
I'm trying to help my sister in-law with her computer (PowerBook G4). She claimed it was having a lot of problems and thought a clean install would fix things. However she had lost her install discs, and now I've seemed to make things worse.
I started by trying to back up her computer - copying the hard drive to an external HD. However I kept getting a -36 Error. I then connected her PowerBook G4 to my MacBook Pro (10.5.8 2.33 Intel) via Firewire and in Target mode used Disk Utility to make a disk image. Unfortunately I got the -36 Error again. I Repaired the hard drive with disk utility, but it said everything was fine. Then I read on the forum that the -36 Error meant that it was a corrupt file that was causing the issue. Since it always errored out in the same area, I simply deleted the folder in that area. After that, the disk image worked.
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Hi BD & RC,
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When I went into the Network settings, it was stuck in a continuous loop with the error "Another application has changed your network settings." I saw BD's help on another post to go into security and check "Require Password to unlock each secure system preference" to break the loop ( huge THANKS!!). After trying to set up multiple new locations, it finally dawned on me that the Airport was not an option. When went into System Profiler and chose Airport Card, it says "No information found."
So long story short... it appears that with all the little issues going on on this computer, the monster issue wouldn't have been solved by a clean install anyway (you were right RC)... the Airport Express card must have died.
I guess she'll either need to start connecting with an ethernet cable or buy a new airport extreme card.
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System won't load after startup repair - Satellite A500

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hi plioe,
can you run chkdsk on the hdd?
do you hear unusual sounds from the harddisk?
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Won't display main menu, even after holding on/off and home buttons simultaneously. Can't get beyond "connect to iTunes " which I can't do anyway.

After several days of inactivity iPad won't display main screen. When I first turned in on, it asked for a four digit passcode. I never had a four digit passcode. After entering "incorrect" passcode, it told me I could try again in 60 minutes. That was day one. Since then, it displays "connect to iTunes" which I can't do. I've tried holding on/off and homebuttons simultaneously. "connect to iTunes" keeps coming up. I'm stuck on that commmand.

iOS: Device disabled after entering wrong passcode
http://support.apple.com/kb/ht1212
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http://tinyurl.com/7ndy8tb
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~~~~~~~~~~~~~
‘iPad is disabled’ fix without resetting using iTunes
Today I met my match with an iPad that had a passcode entered too many times, resulting in it displaying the message ‘iPad is disabled – Connect to iTunes’. This was a student iPad and since they use Notability for most of their work there was a chance that her files were not all backed up to the cloud. I really wanted to just re-activate the iPad instead of totally resetting it back to our default image.
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~~~~~~~~~~~~~
Try it and good luck. You have nothing more to lose if it doesn't work for you.
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OT
TIP: For insurance against the iPhoto database corruption that many users have experienced I recommend making a backup copy of the Library6.iPhoto (iPhoto.Library for iPhoto 5 and earlier versions) database file and keep it current. If problems crop up where iPhoto suddenly can't see any photos or thinks there are no photos in the library, replacing the working Library6.iPhoto file with the backup will often get the library back. By keeping it current I mean backup after each import and/or any serious editing or work on books, slideshows, calendars, cards, etc. That insures that if a problem pops up and you do need to replace the database file, you'll retain all those efforts. It doesn't take long to make the backup and it's good insurance.
I've created an Automator workflow application (requires Tiger or later), iPhoto dB File Backup, that will copy the selected Library6.iPhoto file from your iPhoto Library folder to the Pictures folder, replacing any previous version of it. There are versions that are compatible with iPhoto 5, 6, 7 and 8 libraries and Tiger and Leopard. Just put the application in the Dock and click on it whenever you want to backup the dB file. iPhoto does not have to be closed to run the application, just idle. You can download it at Toad's Cellar. Be sure to read the Read Me pdf file.
NOTE: The new rebuild option in iPhoto 09 (v. 8.0.2), Rebuild the iPhoto Library Database from automatic backup" makes this tip obsolete.

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It means that a third-party system modification you installed is causing the problem.
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Post the lines of output (if any) that appear below what you just entered (the text, please, not a screenshot.)
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Won't display after startup

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