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This site will tell you how to remove the hard drive:<br />
<br />
<a href="http://www.ifixit.com/Device/iMac" rel="ugc">http://www.ifixit.com/Device/iMac</a><br />
<br />
If you have a second Mac, in the shop, you can diagnose the first one by using Target Disk Mode:<br />
<br />
<a href="http://support.apple.com/kb/ht1661" rel="ugc nofollow">http://support.apple.com/kb/ht1661</a>
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This site will tell you how to remove the hard drive:

http://www.ifixit.com/Device/iMac [http://www.ifixit.com/Device/iMac]

If you have a second Mac, in the shop, you can diagnose the first one by using Target Disk Mode:

http://support.apple.com/kb/ht1661 [http://support.apple.com/kb/ht1661]

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I appreciate the help. It did end up being the hard drive. Swapped it out and all is well. I thought I had closed this question--Sorry for the delay!
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I appreciate the help. It did end up being the hard drive. Swapped it out and all is well. I thought I had closed this question--Sorry for the delay!

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Hi Experts -- I have an iMac here in the shop that is showing the question mark folder icon when it turns on. I am unable to access the diagnostic utility by holding down the D key during startup as I typically do. I can, however, get it to boot to a Snow Leopard disc but none of the diagnostic utilities are available (greyed out). <br />
<br />
Any thoughts? I have some suction cups coming in the mail so I can take a look at the hard drive and connections and I'm hoping that's what the problem is.
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Hi Experts -- I have an iMac here in the shop that is showing the question mark folder icon when it turns on. I am unable to access the diagnostic utility by holding down the D key during startup as I typically do. I can, however, get it to boot to a Snow Leopard disc but none of the diagnostic utilities are available (greyed out). 

Any thoughts? I have some suction cups coming in the mail so I can take a look at the hard drive and connections and I'm hoping that's what the problem is.

iMac Question Mark Folder / Startup Problem

All of Apple's hardware is produced solely by Apple Inc., who determines internal systems, designs, and prices. Apple buys certain components wholesale from third-party manufacturers. The current Mac product family uses Intel x86-64 processors. All Mac models ship with at least 1 GB RAM as standard. Current Mac computers use ATI Radeon or nVidia GeForce graphics cards and include a dual-function DVD and CD burner, called the SuperDrive. Current Apple hardware includes the iPad, iPhone, iMac, Mac Pro, Macbook, iPod and Apple TV. Discontinued hardware includes the Apple I, Apple II, and the Apple III, the Lisa, the Newton, the Quadra, Performa, Centris, Macintosh II and LC series, the Power Macintosh, iBooks and the MacBook.

Apple Hardware

Storage devices include any device used for storing and retrieving digital information. Hard disk drives (HDDs) use one or more rigid ("hard") rapidly rotating disks (platters) coated with magnetic material. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. The primary competing technology for secondary storage is flash memory in the form of solid-state drives (SSDs), but HDDs remain the dominant medium for secondary storage due to advantages in price per bit and per-device recording capacity. CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format that allows information to be stored outside the mechanical HDD.

Storage Hardware

Apple's early computers ran on a variety of operating systems, including a Pascal version and one based on CP/M, before releasing its ProDOS with the advent of its 16-bit computer. With the release of the Lisa, which had its own OS, Apple and computing entered the graphical age; it was followed by the Macintosh, which offered a series of "System" operating systems. Other Mac operating systems included PowerPC until Apple acquired NeXT and folded it into the Mac OS. Current operating systems for Apple devices are Mac OS-X and iOS.