Not recognizing second monitor. iMac24 early 2008. Yosemite.

I have a iMac 24. It is a early 2008. I have upgraded to Yosemite.
I can not get the computer to recognize my 2nd monitor. I have used a Mini DisplayPort to VGA Adapter.
The system does not recognize my 2nd monitor.
Thanks, Ernest

Hi ernestj911,
Thanks for contributing to the Apple Support Communities.
If your iMac doesn't seem to recognize your second display, you can use the tips in the "No video or no signal, image distortion, "snow," or flickering" section of this article to troubleshoot the situation:
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Best Regards,
Jeremy

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Just bought a second hand MacPro early 2008 running Mavericks. How do I reset it to standard deleting previous owner admin account?

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The first thing to do with a second-hand computer is to erase the internal drive and install a clean copy of OS X. You—not the original owner—must do that. Changes made by Apple over the years have made this seemingly straightforward task very complex.
How you go about it depends on the model, and on whether you already own another Mac. If you're not sure of the model, enter the serial number onthis page. Then find the model on this page to see what OS version was originally installed.
It's unsafe, and may be unlawful, to use a computer with software installed by a previous owner.
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a. If the machine shipped with OS X 10.4 or 10.5, you need a boxed and shrink-wrapped retail Snow Leopard (OS X 10.6) installation disc from theApple Store or a reputable reseller—not from eBay or anything of the kind. If the machine is very old and has less than 1 GB of memory, you'll need to add more in order to install 10.6. Preferably, install as much memory as it can take, according to the technical specifications.
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To start up from an optical disc or a flash drive, insert it, then restart the computer and hold down the C key at the startup chime. Release the key when you see the gray Apple logo on the screen.
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Message was edited by: EZ Jim

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Greetings:
I am having an issue with using my second monitor for output in PP CC. I have done the following based on another post:
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I do hate replying to my own post but I thought I would post here how I fixed my problem in case anybody else ends up here with a similar one.
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GreenVista, welcome to the forum.
Here is a guide provided by HP to help you connect two monitors to one computer.
Please click "KUDOS Thumbs Up" if I have helped you and click "Accept as Solution" if your problem is solved.
Signature:
HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
HP Omen; i7-4710QH; 8 GB memory; 256 GB San Disk SSD; Win 8.1
HP Photosmart 7520 AIO
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**Click the Thumbs Up+ to say 'Thanks' and the 'Accept as Solution' if I have solved your problem.**
Intelligence is God given; Wisdom is the sum of our mistakes!
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Wed Mar 18 16:45:53 2015
*** Panic Report ***
panic(cpu 1 caller 0xffffff8010e1a46e): Kernel trap at 0xffffff8010dd2d85, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0x000000010150003c, CR3: 0x00000000139bf000, CR4: 0x0000000000002660
RAX: 0xffffff80114de8c0, RBX: 0x0000000000000006, RCX: 0xffffff80114de860, RDX: 0x0000000101500034
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0xffffff8071d83850 : 0xffffff8010e1a46e
0xffffff8071d83a10 : 0xffffff8010e36683
0xffffff8071d83a30 : 0xffffff8010dd2d85
0xffffff8071d83b30 : 0xffffff8010dc4c8b
0xffffff8071d83e60 : 0xffffff80111fd07d
0xffffff8071d83e90 : 0xffffff7f923c0e77
0xffffff8071d83fb0 : 0xffffff8010e14dd7
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14C109
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Darwin Kernel Version 14.1.0: Mon Dec 22 23:10:38 PST 2014; root:xnu-2782.10.72~2/RELEASE_X86_64
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__HIB text base: 0xffffff8010b00000
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com.apple.driver.AppleFileSystemDriver 3.0.1
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
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com.apple.driver.XsanFilter 404
com.apple.iokit.IOAHCIBlockStorage 2.7.0
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com.apple.driver.AirPortBrcm43224 700.36.24
com.apple.iokit.AppleYukon2 3.2.3b1
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com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleACPIButtons 3.1
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com.apple.driver.AppleAPIC 1.7
com.apple.driver.AppleIntelCPUPowerManagementClient 218.0.0
com.apple.nke.applicationfirewall 161
com.apple.security.quarantine 3
com.apple.security.TMSafetyNet 8
com.apple.driver.AppleIntelCPUPowerManagement 218.0.0
com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.3
com.apple.driver.AppleUSBHIDKeyboard 176.2
com.apple.driver.AppleHIDKeyboard 176.2
com.apple.iokit.IOUSBHIDDriver 705.4.0
com.apple.driver.AppleUSBMergeNub 705.4.0
com.apple.driver.AppleUSBComposite 705.4.9
com.apple.iokit.IOATABlockStorage 3.1.1
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com.apple.iokit.IONetworkingFamily 3.2
com.apple.iokit.IOAHCIFamily 2.7.5
com.apple.iokit.IOATAFamily 2.5.3
com.apple.driver.AppleEFINVRAM 2.0
com.apple.driver.AppleEFIRuntime 2.0
com.apple.iokit.IOFireWireFamily 4.5.6
com.apple.iokit.IOUSBFamily 710.4.14
com.apple.iokit.IOHIDFamily 2.0.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.sandbox 300.0
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I found your post whilst researching my options for connecting 2 x My Book Studio II (both are the 4TB version) to my MacMini 2010 running Snow Leopard.
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Not recognizing second monitor. iMac24 early 2008. Yosemite.

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