Blue wavy lines during start up

Asking on behalf of a non-internet connected friend running a c 2001 Power Mac G4 (pre-MDD) which displays wavy blue horizontal lines scrolling down the screen during start up and for maybe 30 seconds afterwards. From then on it's fine. Is this an early sign of trouble and if so, graphics card or monitor?

What type of monitor are you using? CRT or LCD? If CRT(old tube,heavy type) can be affected by AC power line 60HZ frequency at startup of monitor if monitor is old.Other possibility is that it is not grounded well. Try changing the plug to a different AC outlet.If you can try another monitor and it does the same thing, it is most likely the Graphics Card .I doubt that if you have an LCD(Flat display) that it is the LCD. LCD's don't use AC voltages to cause those blue scanning lines. I could be wrong. Also see if all connectors are tight.

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Blue screen appears during start up and freezes

During start up the apple logo appears and locks up. Re booting results in blue screen. After re booting 3 or 4 times finally boots fine.

If you are still not working properly you might want to try the recovery mode http://support.apple.com/kb/HT1808
It is a useful link to keep in mind.

Blue Screen Error during starting Windows Server 2008 R2 (VM on Hyper-v WinSvr2012) Using a Physical to Virtual (P2V) VHDX.

Hi There,
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and it crashed, a blue screen poped up saying "A Problem has been detected and windows has shut down to prevent damage to your computer ... ) and then system got rebooted automatically.
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Any idea?

1. You have placed your problem in wrong forum. Address your problem to Server forum instead.
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Blue screen appears during start up

Hi! My macbook before it bacame a blue screen, shows that the start up disk is almost full but i ignored it...and then suddenly it doesn't start up anymore and shows only blue screen with arrow...pls help! I don't know much about computers! :(

Boot up in Safe Mode.
Startup your Mac in Safe Mode
A Safe Mode boot takes much longer than a normal boot so be patient.
Once you are in Safe Mode, you need to delete data in order to free up disk space, ie., photos, video, etc.
When you are in Safe Mode, control click the MacintoshHD icon on the desktop then click Get Info. You'll see Capacity & Available. You need at least 15% available disk space.
Then click Restart from the Apple () menu.

Stuck in unix command line during start-up. Help please.

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After experiencing a number of freezes and crashes, I was having problems starting up with the system on the hard drive. I booted up with Disk Warrior 3.0 and it told me my directory was severely damaged so I rebuilt it using Disk Warrior.
After it was successfully rebuilt, I quit DW and re-booted. When the computer restarted first I got the usual gray screen with the Apple logo and the moving gear wheel. After about 20 seconds the screen becomes black with the following text in white in the upper left corner: "local host: / root #" and then a white cursor mark. I have repeatedly tried to re-boot but get the same black screen and text. I booted with the original OS X install disk and used Disk Utility to repair permissions but I still get the black screen and white test on start-up.
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Hi Robert,
Welcome to Discussions.
You need to run some fsck commands, as detailed in this Apple Document.
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My Imac froze earlier today as I was dragging an image from safari into indesig and when it froze the weirdest pattern overlaid the screen. It looked just like the opacity pattern from photoshop with grey and white squares. I turned the computer off using the power button and unplugged everything.
Now when I try to start it these weird lines appear on my start up screen (see link)...
http://meijerladdaruppgrejer.wordpress.com/2012/07/24/oops/
as you can see the apple and the wheel appears as normal...
... then it moves to a normal looking white screen (perhaps a bit greener than usual) and around 30 seconds later freezes at the blue screen.
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If i press alt during start up I can see and choose my hard drive but just end up at the blue screen again.
Can I try starting it up in safe mode or something?
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Is this the same problem? Verical Lines" seems a bit diffuse. I've seached for a similar question and found a lot of other types of lines and stripes.
Could this be a solution?
http://support.apple.com/kb/TS3824?viewlocale=en_US&locale=en_US
If so, how do I install the update if I can't get passed the blue screen? Can I start my Imac in safe mode? How?
iMac (Mid 2011): Unresponsive white screen on startup or vertical lines on screen
Symptoms
In certain circumstances, your iMac (Mid 2011) may become unresponsive on startup, with a white or gray background on the display. You may also notice vertical lines on the display while using your iMac.
Resolution
Install the iMac Graphics Firmware Update 2.0 if your computer exhibits these issues. To install the update, chooseSoftware Update from the Apple () menu and follow the onscreen instructions.
Important: Do not interrupt the power to the computer while the update is installing. After the update is finished installing, you will need to restart your iMac.

After installing yosemite start up screen has black wavy lines

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Hey wealthylives,
Welcome to the HP Forums!
As the computer screen is remaining black/blank after the hard reset, I would suggest the following document 'Troubleshooting Black Screen Displays with No Error Messages During Startup or Boot'. Please follow through the steps outlined in order.
Please let me know the outcome of the troubleshooting.
Thank you.
I worked on behalf of HP

What would cause a prolonged blue screen during start up?

I have an iMac desktop. Recently I've had trouble with a prolonged blue screen during start up (approx. 10 mins) before it finally takes me to the login screen. Any ideas why this is happening?
Jeff P.

Hi Jeff,
Open console in Applications>Utilities, check the system log for the date/time of the last problem Startup for clues.

Blue screen of death during start-up

Hey Adobe-Community,
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Provide the crash details from your event viewer:
Working with your Operating System’s Tools
Mylenium

Ken Burns: wavy line issue during zoom

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The render bar on top of the timeline is dark-green for good-looking images, which according to the final cut manual, means 'no render necessary'
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BJ_pkt
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I've searched and searched and cannot find a way to draw a
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if you don't want a direct line from one mouse position to
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An internal error occurred during: "Starting BEA WebLogic Server v8.1 at lo

Hi,
On "Start the server in debug mode"
file .log
eclipse.buildId=I20090611-1540
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BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=es_AR
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Tanks and sorry my English.
Gustavo

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Many thanks.

Blue wavy lines during start up

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