IMac (Early 2009) freezes at Apple Logo

Hi Everyone,
This is my first post, and I'm going to be as detailed as possible here.
_Background Information_
I work in a public school system, and we have a lab of 20-inch Early 2009 iMacs currently running 10.5.8 as well as Windows XP via Bootcamp (running CAD software). Being that these machines are at a high school, we have a firmware password set so that students can't go in and mess around.
Recently, a few of these machines have been freezing at the gray Apple logo during startup. I've been able to fix them by doing the following:
-Boot to install disc
-Remove firmware password and restart
-Reset the PRAM
-Boot to install disc and reset firmware password
This fixes the issue. I recently also ARD'ed a permission repair and disk verify to the whole lab to see if that helps stop the issue from recurring.
_My Current Issue_
I have one machine that is currently doing the same thing: it boots to the gray Apple logo and freezes before it reaches the spinning gear. I was ready to perform the above procedure to fix it, however, I have a second problem: the optical drive is malfunctioning. When I insert any disc, the drive makes a loud clicking sound and attempts to eject the disc (at which point it gets stuck and I have to physically pull on it to get it out).
Because of the firmware password in place, I can't perform a Safe Boot, PRAM reset, verbose or single-user boot, etc. I CAN, however, get to the Startup Manager with an option boot.
*Here is the troubleshooting I have done so far.* And the issue only gets weirder...
-Unplugged everything and booted with a minimal system. Hangs at Apple logo.
-Put an install disc in my Macbook Pro, booted that into Target Disk mode, connected it to the iMac via Firewire, and tried Option-booting the iMac to the install disc that way. Here, it gets to the Apple logo with the spinning gear, and shortly afterward, it freezes (spinning gear still visible but not moving).
-I tried also booting to the internal HD of my Macbook Pro with the above method with the same result. Hangs at frozen spinning gear.
-Option-booting to a DeployStudio flash drive to hopefully at least get to Disk Utility. iMac still freezes at the spinning gear stage.
-Option-booting to the Windows XP side. It freezes during the "Loading Windows" screen.
I am beginning to run out of ideas. I am an Apple Certified Macintosh technician, so it is possible for me to replace the optical drive... but I'm hoping that there is something I haven't thought of yet which can fix it without me having to open the machine. Any ideas would be appreciated. Thanks!
- Matt

UPDATE:
Shortly after I posted this, I realized the one thing that I hadn't tried yet. I removed one of the two sticks of RAM, then booted the machine and was able to immediately reset the PRAM. At that point, the machine booted normally. I shut it down, re-added the RAM chip, and booted normally again.
Looks like it's all set for now.

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Only way to get back to it, is to do a hard reset by holding the Power button for a while. Then it starts up normal. Sometimes it asks for sending a Crashreport sometimes not.
Does anybody have an idea?
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Specs are as follows:
iMac "Core 2 Duo" 3.06 24-Inch Aluminum (Early 2009) (E8435)
6 MB shared level 2 cache
1066 MHz system bus
8GB of RAM (1066 MHz DDR3 SDRAM)
1 TB (7200 RPM)
NVIDIA GeForce GT 130 graphics - 512 MB GDDR3
Log of the shut down follows. Thank you very much in advance if anyone has any idea what is wrong.
Mon Oct 6 22:29:21 2014
panic(cpu 0 caller 0xffffff7f99628f30): NVRM[0/2:0:0]: Read Error 0x0061002c: CFG 0x00000000 0x00000000 0x04000000, BAR0 0xd2000000 0xffffff8124c6e000 0x094700a1, D0, P3/4
Backtrace (CPU 0), Frame : Return Address
0xffffff81233cbbe0 : 0xffffff8018a22f79
0xffffff81233cbc60 : 0xffffff7f99628f30
0xffffff81233cbd20 : 0xffffff7f996f250a
0xffffff81233cbd60 : 0xffffff7f998c991c
0xffffff81233cbd80 : 0xffffff7f996c68c7
0xffffff81233cbda0 : 0xffffff7f99769dbf
0xffffff81233cbe20 : 0xffffff7f99610fce
0xffffff81233cbee0 : 0xffffff7f995debc5
0xffffff81233cbf20 : 0xffffff8018a4a20a
0xffffff81233cbfb0 : 0xffffff8018ad7607
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         com.apple.nvidia.classic.NVDAResmanTesla(8.2.4)[D61B2BB9-4289-318D-9197-5E1E13B 1FF32]@0xffffff7f995d9000->0xffffff7f99841fff
            dependency: com.apple.iokit.IOPCIFamily(2.9)[2852ACFE-FD28-3C37-9B39-885201BB8D25]@0xffffff 7f990bf000
            dependency: com.apple.iokit.IONDRVSupport(2.4.1)[D41125CE-69BD-32E7-9B1D-4E83431662DD]@0xff ffff7f995c9000
            dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[75D81741-64C1-3941-ADFA-9D6B6C434EE4]@0 xffffff7f99586000
         com.apple.nvidia.classic.NVDANV50HalTesla(8.2.4)[B0E6AAA7-E970-3D81-8B43-145D56 A3A4AC]@0xffffff7f9984c000->0xffffff7f99af5fff
            dependency: com.apple.nvidia.classic.NVDAResmanTesla(8.2.4)[D61B2BB9-4289-318D-9197-5E1E13B 1FF32]@0xffffff7f995d9000
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BSD process name corresponding to current thread: kernel_task
Mac OS version:
13F34
Kernel version:
Darwin Kernel Version 13.4.0: Sun Aug 17 19:50:11 PDT 2014; root:xnu-2422.115.4~1/RELEASE_X86_64
Kernel UUID: 9477416E-7BCA-3679-AF97-E1EAAD3DD5A0
Kernel slide:     0x0000000018800000
Kernel text base: 0xffffff8018a00000
System model name: iMac9,1 (Mac-F2218FA9)
System uptime in nanoseconds: 116336346660163
last loaded kext at 73429381599468: com.apple.driver.AppleUSBCDC 4.2.1b5 (addr 0xffffff7f9ae9f000, size 20480)
last unloaded kext at 73492603237583: com.apple.driver.AppleUSBCDC 4.2.1b5 (addr 0xffffff7f9ae9f000, size 16384)
loaded kexts:
com.apple.filesystems.smbfs 2.0.3
com.apple.driver.AudioAUUC 1.60
com.apple.driver.AppleHWSensor 1.9.5d0
com.apple.iokit.IOUserEthernet 1.0.0d1
com.apple.iokit.IOBluetoothSerialManager 4.2.7f3
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AGPM 100.14.34
com.apple.filesystems.autofs 3.0
com.apple.driver.AppleMikeyHIDDriver 124
com.apple.driver.AppleHDA 2.6.3f4
com.apple.driver.AppleMikeyDriver 2.6.3f4
com.apple.driver.AppleBacklight 170.4.11
com.apple.GeForceTesla 8.2.4
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.2.7f3
com.apple.driver.AppleHWAccess 1
com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0
com.apple.driver.AppleLPC 1.7.0
com.apple.driver.AppleUpstreamUserClient 3.5.13
com.apple.driver.AppleMCCSControl 1.2.5
com.apple.driver.AppleIRController 325.7
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeLZVN 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.BootCache 35
com.apple.iokit.SCSITaskUserClient 3.6.7
com.apple.driver.XsanFilter 404
com.apple.iokit.IOAHCIBlockStorage 2.6.0
com.apple.driver.AppleUSBHub 683.4.0
com.apple.driver.AppleFWOHCI 5.0.2
com.apple.driver.AirPort.Brcm4331 700.20.22
com.apple.driver.AppleAHCIPort 3.0.5
com.apple.nvenet 2.0.21
com.apple.driver.AppleUSBEHCI 660.4.0
com.apple.driver.AppleUSBOHCI 656.4.1
com.apple.driver.AppleRTC 2.0
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleACPIButtons 2.0
com.apple.driver.AppleSMBIOS 2.1
com.apple.driver.AppleACPIEC 2.0
com.apple.driver.AppleAPIC 1.7
com.apple.driver.AppleIntelCPUPowerManagementClient 217.92.1
com.apple.nke.applicationfirewall 153
com.apple.security.quarantine 3
com.apple.driver.AppleIntelCPUPowerManagement 217.92.1
com.apple.iokit.IOSCSIBlockCommandsDevice 3.6.7
com.apple.iokit.IOUSBMassStorageClass 3.6.0
com.apple.iokit.IOSurface 91.1
com.apple.iokit.IOSerialFamily 10.0.7
com.apple.iokit.IOBluetoothFamily 4.2.7f3
com.apple.AppleGraphicsDeviceControl 3.6.22
com.apple.kext.triggers 1.0
com.apple.driver.DspFuncLib 2.6.3f4
com.apple.vecLib.kext 1.0.0
com.apple.iokit.IOAudioFamily 1.9.7fc2
com.apple.kext.OSvKernDSPLib 1.14
com.apple.driver.AppleBacklightExpert 1.0.4
com.apple.nvidia.classic.NVDANV50HalTesla 8.2.4
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.2.7f3
com.apple.iokit.IOFireWireIP 2.2.6
com.apple.driver.AppleHDAController 2.6.3f4
com.apple.iokit.IOHDAFamily 2.6.3f4
com.apple.driver.AppleSMC 3.1.8
com.apple.driver.IOPlatformPluginLegacy 1.0.0
com.apple.driver.AppleSMBusPCI 1.0.12d1
com.apple.driver.IOPlatformPluginFamily 5.7.1d6
com.apple.driver.AppleSMBusController 1.0.12d1
com.apple.nvidia.classic.NVDAResmanTesla 8.2.4
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.iokit.IOGraphicsFamily 2.4.1
com.apple.driver.AppleUSBHIDMouse 180.9
com.apple.driver.AppleHIDMouse 180.9
com.apple.driver.AppleUSBHIDKeyboard 170.15
com.apple.driver.AppleHIDKeyboard 170.15
com.apple.iokit.IOUSBHIDDriver 660.4.0
com.apple.driver.AppleUSBMergeNub 650.4.0
com.apple.driver.AppleUSBComposite 656.4.1
com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.6.7
com.apple.iokit.IOBDStorageFamily 1.7
com.apple.iokit.IODVDStorageFamily 1.7.1
com.apple.iokit.IOCDStorageFamily 1.7.1
com.apple.iokit.IOAHCISerialATAPI 2.6.1
com.apple.iokit.IOSCSIArchitectureModelFamily 3.6.7
com.apple.iokit.IOUSBUserClient 660.4.2
com.apple.iokit.IOFireWireFamily 4.5.5
com.apple.iokit.IO80211Family 640.36
com.apple.iokit.IOAHCIFamily 2.6.5
com.apple.iokit.IONetworkingFamily 3.2
com.apple.iokit.IOUSBFamily 686.4.1
com.apple.driver.NVSMU 2.2.9
com.apple.driver.AppleEFINVRAM 2.0
com.apple.driver.AppleEFIRuntime 2.0
com.apple.iokit.IOHIDFamily 2.0.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.sandbox 278.11.1
com.apple.kext.AppleMatch 1.0.0d1
com.apple.security.TMSafetyNet 7
com.apple.driver.AppleKeyStore 2
com.apple.driver.DiskImages 371.1
com.apple.iokit.IOStorageFamily 1.9
com.apple.iokit.IOReportFamily 23
com.apple.driver.AppleFDEKeyStore 28.30
com.apple.driver.AppleACPIPlatform 2.0
com.apple.iokit.IOPCIFamily 2.9
com.apple.iokit.IOACPIFamily 1.4
com.apple.kec.pthread 1
com.apple.kec.corecrypto 1.0
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Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1067 MHz, 0x802C, 0x31364A53463531323634485A2D3147314431
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8E), Broadcom BCM43xx 1.0 (5.106.98.100.22)
Bluetooth: Version 4.2.7f3 14616, 3 services, 15 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: WDC WD1001FALS-40K1B0, 1 TB
Serial ATA Device: OPTIARC DVD RW AD-5670S
USB Device: Built-in iSight
USB Device: Keyboard Hub
USB Device: Mass Storage Device
USB Device: Apple Optical USB Mouse
USB Device: Apple Keyboard
USB Device: IR Receiver
USB Device: BRCM2046 Hub
USB Device: Bluetooth USB Host Controller
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DVD-ROM drive compatible with dual-layer DVDs (SuperDrive for burning DVDs; Blu-ray burner for creating Blu-ray Disc media)
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IMac (Early 2009) freezes at Apple Logo

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