G5 boots but displays nothing on screen and sometimes white screens and boots from CD. Help?

I have a G5 (1.8 Ghz/DP/8GB RAM) and it has a problem.
When it does show something on screen it shows a white screen and will boot from a CD (OS X or Linux) but when it doesn't it show anything on screen and the fans rev up (This happens whether is shows nothing or white screens) Does anyone know how to fix this?
PS: When it boots from the CD everything works fine.

Backup your data if you have a successful boot. You have no idea what may be damaged or not.
See this data recovery routine if needed:
https://discussions.apple.com/docs/DOC-1689

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Here is what I get :
Nothing happens. It keeps on turning. What should I do?
Thx!
Quentin Giroud

Found that. Worked for me :
Close the Creative Cloud application.
Navigate to the OOBE folder.
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Mac OS: /Users/[user name]/Library/Application Support/Adobe/OOBE folder
Delete the opm.db file.
Launch Creative Cloud.

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Hello there, RFJA2211.
The following Knowledge Base article offers up some great troubleshooting steps for unexpected power off of your iOS device:
iPhone: Hardware troubleshooting
http://support.apple.com/kb/ts2802
Will not turn on, will not turn on unless connected to power, or unexpected power off
Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIsand corrosion.
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The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
Something other than the Home screen or Low Battery image appears, continue with this article for further troubleshooting steps.
If the iPhone did not turn on, reset it while connected to the iPhone USB power adapter.
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If the display remains black, go to next step.
Connect the iPhone to a computer and open iTunes. If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone. If the iPhone doesn't appear in iTunes or if you have difficulties in restoring the iPhone, see this article for further assistance.
If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
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Hello candymerna,
At this point I would recommeng resetting the device if if will not turn on.
Resetting your device
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From: iPhone, iPad, iPod touch: Turning off and on (restarting) and resetting
http://support.apple.com/kb/ht1430
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Also refer to iPhone and iPod touch: Charging the battery.
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iOS: Device not recognized in iTunes for Windows
http://support.apple.com/kb/TS1538
or
iOS: Device not recognized in iTunes for Mac OS X
http://support.apple.com/kb/ts1591
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Ok sorry ill try and make this more detailed.
Hi all. I just got my MSI R6850 Power cyclone edition Graphics card. Now i will try and put more detail to this post but i havent had much sleep so sorry if i don't add as much detail as i can. Here goes. The numbers on the back of the Card go as following
R6850 CYCLONE 1GD5-S/N602-v244-13sb1107028556. Here is also a link to the Website i bought it from.http://www.ebuyer.com/279842-msi-hd-6850-cyclone-1gb-gddr5-dual-dvi-hdmi-dp-pci-e-graphics-r6850-cyclone-1gd5.
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Gigabyte 880GA-UD3H here is a link to this aswell http://uk.gigabyte.com/products/product-page.aspx?pid=3628#ov. Oh and i looked between my PCIE slots but i couldn't find a model name or number
Corsair GS600 watt PSU
Corsair GS600 Power Supply (CMPSU-600G)
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600 Watts @ 40°C ambient temperature
Samsung HD103SJ Spinpoint F3 1TB Hard Drive SATAII 7200rpm 32MB Cache
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Samsung HD103SJ Spinpoint F3 1TB Hard Drive SATAII 7200rpm 32MB Cache
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G5 boots but displays nothing on screen and sometimes white screens and boots from CD. Help?

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