In the middle of start up my display flashes black white lines

I have a Mac Pro Quad dual core 2.66 processor, 14 gigs memory,1 tera,500 gig,360 gig hard drives
OS X 10.6.8 update software download,then I installed it.
Then the computer stalled so I rebooted it...during the start up process it stopped and
the monitor has flashing black and white lines.I can't open the cd,or have control of the mouse or keyboard.
What can I do to fix this problem...?

what ever upgrade the software downloaded is the problem
You didn't mention this in your first post. Any idea what it was? Backups?
Besides that, this may be a fault in the video card, driver, or a screen fault.
Courtesy of BDAqua (if possible):
Take a screen shot & view that in Preview, move the Preview window around, if you see double lines it's a Video card/VRAM problem, if the lines do not move moving the pic around then it's the LCD or cable.

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Hi PUSH,
If you are having intermittant issues with your Thunderbolt display, you may find the following article helpful:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
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- Brenden

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Immediately after powering on/restartingthe machine you can try to hold command + R down and see if that launches the recovery console (or whatever it's called for OS X)

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See:How do I do a clean install of Flash Player?
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Weird; I don't think I've seen anything matching that description yet. No display problems when booting into Firewire Target Disk mode suggests the CRT/analog assembly is mostly fine, but the expected corrupted video drivers would have been corrected with the OS reinstall. If the problem were with part of the ATI video display chipset, it would be a first to me that the native 640x480 resolution is OK but other settings are not. Still, it might be worth trying two things. One, check the PRAM battery; if you have a multimeter, it should read within 0.1v of 3.6v while under load (still in the battery holder). Battery location and replacement details are at eMac - Do-It-Yourself.
Two, try resetting NVRAM. Holding downcommand-option-p-r keys at startup until you hear three sets of chimes, then releasing the keys will reset PRAM settings (per What's stored in PRAM?). Resetting PRAM is supposed to do everything that clearing NVRAM does, but there's a long-standing body of ancedotal evidence that NVRAM is better thought of as a superset of PRAM (although this may not be nerly as true for OS X as it was in OS 9 and earlier). You can fo even firther and reset the Open Firmware settings as well. To reset the Open Firmware settings:
restart holding down the command-option-o-f keys; at the "Welcome to Open Firmware" message (black text on a white screen) type in the following at the command prompt and press return after each (case sensitive, no spaces):
reset-nvram
set-defaults
reset-all
The Mac should restart after reset-all (if it doesn't, type mac-boot and press Return)
Good luck!

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Yeah, there seems to be many of us with a common problem. I guess Apple will issue a work around or patch at sometime.
However, the Airmail app I mentioned before is worth a look - has worked fine since I purchased it. I admit it doesn't solve the problem of accessing any emails you need that are stored in the Mail application....
You might be able to get to copies of them on the relevant server of your email account provider via whatever browser you use (web mail).
My friend who has a much newr MacBook Pro isn't having any Mail issues....so maybe Apple are unwittingly pushing us with older systems to upgrade...I'm not really a cynic

So i have a 2011 MacBook Pro and when i turned it on this morning a flashing folder came on with a question mark in the middle of it and it keeps flashing. So i tried googling any solutions and up so far nothing has worked. Please Help ?

I tried googling several solutions, but so far nothing seems to work. Everytime i start up my laptop i press CMND+R to make it go to the repair disk utility but instead it takes me as if i have to install lion when i had Snow Leopard 10.6.8. When i do go to the repair disk utility, on the eft hand side shows two hardrives one is Untitled and another is Hitachi, i tried downloading snow leopard 10.6.8 onto a Re-writable disc using my windows computer. When i insterted it onto the disc drive it came out under SUPER DRIVE and everytime i double click on the CD it says something about attaching images/ I also forgot to mention that the MAC OSX 10.6.8 Update shows on the left hand side on the bottom in DMG format. I dont know what else to do, please help?

DestroyGalaxies wrote:
a flashing folder came on with a question mark in the middle of it
This is the firmware telling you it can't find a bootable OS X volume.
Usually to solve this all you do is hold the option key down on the built in keyboard while booting the computer, this enters Startup Manager and then you choose OS X to boot, then in System Preferences > Startup Disk you change it to the boot volume and it tells the firmware.
Everytime i start up my laptop i press CMND+R to make it go to the repair disk utility but instead it takes me as if i have to install lion when i had Snow Leopard 10.6.8.
What you have is a 10.7 or 10.8 Recovery HD from when 10.7 or 10. was on the machine previously.
The Macintosh HD partition only was erased and 10.6 installed on it, without erasing the entire drive like what should have occured to remove the Recovery HD partition.
So you have a mucked up machine.
i tried downloading snow leopard 10.6.8 onto a Re-writable disc using my windows computer.
Well there goes your problem there, your downloading illegal copies of Snow Leopard from a untrusted location.
10.6 is not available for download, except from pirate sites. You likely have malware or a compromised system.
I dont know what else to do, please help?
What you need to do is call Apple via phone, tell them the make of your machine and order the appropriate 10.6 disks, they are inexpensive now. Some machines that came with 10.6.3+ origianlly need machine specific disks, other wise pre-10.6.3 Intel Macs can use the 10.6.3 white retail disks.
Once you have the disks, you need to backup your personal information off the computer to a external storage drive using the emergency quick copy method, then disconnect it to prevent mistakes.
Most commonly used backup methods
Next follow this proceedure and make sure to select the ENTIRE drive on the far left with the drive makers name and size, this will erase the entire drive, then install 10.6 from the disk
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When finished setup the machine and log onto the Internet and use Software Update to get current on 10.6.8
Don't use pirated software, it's likely been compromised in some fashion.

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The tip above led me to the fix needed.
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This worked for me:
Step 1: Delete system windowserver preferences
In the Finder, from the menu bar, select "Go -> Go to Folder..."
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Delete the file called com.apple.windowserver.plist
Step 2: Delete user windowserver preferences
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OT

In the middle of start up my display flashes black white lines

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