Fan is running on high speed, no signal to the monitor!

Hi!
I have the following Problem with my G5:
It worked perfectly, but suddenly yesterday, I switched it on, it began just like always to boot the system, but i had no signal to the monitor.
After a couple of seconds the fan started to run very fast and did not stop anymore (at least for then minutes, then I switched the G5 off, because it's annoying)! I've treid it again, but the same Problem occured...
Has anyone else already had this Problem?
What are the reasons for this, and how can i solve this Problem?
Cheers, Markus

Hello Markus, and a warm welcome to the forums!
Boot off your original G5 Install Disk while holding down Option/alt key to select AHT, then run the extended Apple Hardware Test.
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot.

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    iMac (Retina 5K, 27-inch, Late 2014) (Technical Specifications)
    iMac - model: iMac15,1
    1 4 GHz Intel Core i7 CPU: 4-core
    32 GB RAM Upgradeable
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        BANK 1/DIMM0
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        BANK 0/DIMM1
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        BANK 1/DIMM1
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    AMD Radeon R9 M295X - VRAM: 4096 MB
        iMac spdisplays_5120x2880Retina
System Software: ℹ️
    OS X 10.10.2 (14C1514) - Time since boot: 0:31:53
Disk Information: ℹ️
    APPLE SSD SM0512F disk1 : (500,28 GB)
        EFI (disk1s1) <not mounted> : 210 MB
        Macintosh SSHD (disk1s2) / : 499.42 GB (251.32 GB free)
        Recovery HD (disk1s3) <not mounted> [Recovery]: 650 MB
    Samsung SSD 840 EVO 750GB disk0 : (750,16 GB)
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        Apple Inc. Bluetooth USB Host Controller
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    Apple, Inc. Keyboard Hub
        Apple Inc. Apple Keyboard
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    Apple Inc. thunderbolt_bus
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    Anywhere
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        /Applications/Toast 11 Titanium/Spin Doctor.app
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    ProTec6b: Path: /Library/StartupItems/ProTec6b
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Launch Agents: ℹ️
    [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [loaded]    com.adobe.CS5ServiceManager.plist [Click for support]
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    [not loaded]    com.teamviewer.teamviewer.plist [Click for support]
    [not loaded]    com.teamviewer.teamviewer_desktop.plist [Click for support]
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    [loaded]    com.adobe.fpsaud.plist [Click for support]
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    [loaded]    com.symantec.Sched505-3.plist [Click for support]
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    Adobe Reader    Programm (/Applications/Adobe Reader.app)
    Dropbox    Programm (/Applications/Dropbox.app)
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    Google Earth Web Plug-in: Version: 7.0 [Click for support]
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    QuickTime Plugin: Version: 7.7.3
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    AdobePDFViewer: Version: 10.1.5 [Click for support]
    JavaAppletPlugin: Version: 15.0.0 - SDK 10.10 Check version
User internet Plug-ins: ℹ️
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Safari Extensions: ℹ️
    1Password
    ExifExt
Audio Plug-ins: ℹ️
    DVCPROHDAudio: Version: 1.2
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    Volumes being backed up:
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        Total number of backups: 39
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         0%    Dropbox
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Fan is running on high speed, no signal to the monitor!

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