IMac G5 Wont Boot Up

I have an iMac G5 1.9GHz (iSight) which will not boot.
Dont know the prior history as was only given to me a couple of days ago.
It has managed to 'boot' twice.. once getting a kernel panic & once getting to the grey apple screen, but thats it.
I have just purchased a new (& correct spec) RAM chip for it but still nothing. This is also the model with 512mb RAM built in to motherboard (only has one onboard RAM slot at the base of the unit for upgrading/additional RAM)
It does not let me boot from the original CD as it doesnt get that far into the boot/startup cycle, likewise I cannot reset PRAM from the keyboard during this phase as well.
I believe that this model does not have a PMU reset button on the motherboard, but instead uses the power button.
Anyone offer any pointers as to how to kick start this iMac to life would be much appreciated.

You can try resetting the SMU by removing all peripherals, shut down, remove the power cord, wait 10 seconds, reinsert the power cord while holding down the power button, release the power button and push it again to reboot.
If you continue to have problems, there may be a problem with the motherboard, and you should probably take it in and have it looked at.
Let us know how you make out,

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    Will it boot from the OSX DVD?

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    There are Support articles online at Apple's site which can help resolve the issue of a lost Firmware password; and how to set them correctly, depending on the hardware or machine series, or OS version.
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    Jontydog wrote:
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    Hardware Information:
              iMac (21.5-inch, Mid 2011)
              iMac - model: iMac12,1
              1 2.5 GHz Intel Core i5 CPU: 4 cores
              4 GB RAM
    Video Information:
              AMD Radeon HD 6750M - VRAM: 512 MB
    System Software:
              OS X 10.9.1 (13B42) - Uptime: 0 days 0:45:16
    Disk Information:
              ST3500418AS disk0 : (500.11 GB)
                        EFI (disk0s1) <not mounted>: 209.7 MB
                        Macintosh HD (disk0s2) /: 499.25 GB (350.35 GB free)
                        Recovery HD (disk0s3) <not mounted>: 650 MB
              OPTIARC DVD RW AD-5690H 
    USB Information:
              Apple Inc. FaceTime HD Camera (Built-in)
              Samsung SCX-4600 Series
              Apple Inc. BRCM2046 Hub
                        Apple Inc. Bluetooth USB Host Controller
              Apple Internal Memory Card Reader
              Apple Computer, Inc. IR Receiver
    FireWire Information:
    Thunderbolt Information:
              Apple Inc. thunderbolt_bus
    Kernel Extensions:
              com.sophos.kext.sav          (8.0.14)
    Startup Items:
              MobileBrServ: Path: /Library/StartupItems/MobileBrServ
    Problem System Launch Daemons:
    Problem System Launch Agents:
    Launch Daemons:
              [loaded] com.adobe.fpsaud.plist 3rd-Party support link
              [loaded] com.adobe.SwitchBoard.plist 3rd-Party support link
              [loaded] com.anchorfree.ajaxserver.plist 3rd-Party support link
              [loaded] com.microsoft.office.licensing.helper.plist 3rd-Party support link
              [loaded] com.sophos.autoupdate.plist 3rd-Party support link
              [loaded] com.sophos.intercheck.plist 3rd-Party support link
              [loaded] com.sophos.notification.plist 3rd-Party support link
    Launch Agents:
              [not loaded] com.adobe.AAM.Updater-1.0.plist 3rd-Party support link
              [loaded] com.adobe.CS5ServiceManager.plist 3rd-Party support link
              [loaded] com.sophos.uiserver.plist 3rd-Party support link
    User Launch Agents:
              [loaded] com.adobe.AAM.Updater-1.0.plist 3rd-Party support link
              [failed] com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist 3rd-Party support link
              [loaded] com.divx.agent.postinstall.plist 3rd-Party support link
              [loaded] com.google.keystone.agent.plist 3rd-Party support link
    User Login Items:
              iTunesHelper
              BitTorrent
    Internet Plug-ins:
              Flip4Mac WMV Plugin: Version: 2.4.4.2 3rd-Party support link
              FlashPlayer-10.6: Version: 12.0.0.38 - SDK 10.6 3rd-Party support link
              OVSHelper: Version: 1.1 3rd-Party support link
              Flash Player: Version: 12.0.0.38 - SDK 10.6 3rd-Party support link
              Default Browser: Version: 537 - SDK 10.9
              DivXBrowserPlugin: Version: 2.2 3rd-Party support link
              QuickTime Plugin: Version: 7.7.3
              SharePointBrowserPlugin: Version: 14.0.0 3rd-Party support link
              JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Outdated! Update
    Audio Plug-ins:
              BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
              AirPlay: Version: 1.9 - SDK 10.9
              AppleAVBAudio: Version: 2.0.0 - SDK 10.9
              iSightAudio: Version: 7.7.3 - SDK 10.9
    3rd Party Preference Panes:
              DivX  3rd-Party support link
              Flash Player  3rd-Party support link
              Flip4Mac WMV  3rd-Party support link
              Growl  3rd-Party support link
    Bad Fonts:
              None
    Old Applications:
              /Library/Sophos Anti-Virus
                        SophosAntiVirus:          Version: 8.0.8.1 - SDK 10.5 3rd-Party support link
                        SophosAutoUpdate:          Version: 8.0.15 - SDK 10.5 3rd-Party support link
                        SophosUIServer:          Version: 8.0.21 - SDK 10.5 3rd-Party support link
                        InterCheck:          Version: 8.0.8.1 - SDK 10.5 3rd-Party support link
              VLC:          Version: 2.0.1 - SDK 10.5 3rd-Party support link
              Sophos Anti-Virus:          Version: 8.0.21 - SDK 10.5 3rd-Party support link
              Spotify:          Version: 0.8.4.93.gd9f49c35 - SDK 10.5 3rd-Party support link
              Install Spotify:          Version: 1.0 - SDK 10.5 3rd-Party support link
                        /Users/[redacted]/Downloads/Programs/Install Spotify.app
    Time Machine:
              Time Machine not configured!
    Top Processes by CPU:
                   2%          WindowServer
                   2%          EtreCheck
                   0%          Google Chrome
                   0%          hidd
                   0%          SophosUIServer
    Top Processes by Memory:
              438 MB          firefox
              139 MB          InterCheck
              119 MB          com.apple.IconServicesAgent
              106 MB          Google Chrome
              78 MB          mds_stores
    Virtual Memory Information:
              370 MB          Free RAM
              1.59 GB          Active RAM
              1.25 GB          Inactive RAM
              813 MB          Wired RAM
              397 MB          Page-ins
              0 B          Page-outs
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