"For the main 3.5" SATA hard drive bay in the new 2011 machines, Apple has altered the SATA power connector itself from a standard 4-pin power configuration to a 7-pin configuration. Hard drive temperature control is regulated by a combination of this cable and Apple proprietary firmware on the hard drive itself.
From our testing, we've found that removing this drive from the system, or even from that bay itself (losing chassis GND?-Mike), causes the machine's hard drive fans to spin at maximum speed and replacing the drive with any non-Apple original drive will result in the iMac failing the Apple Hardware Test (AHT)"

I look forward to the various workarounds for this that I'm sure will appear. (Do previous utils like HDD Fan Control work w/2011 iMacs?)
(Update - on Friday OWC posted a better/more detailed blog page on this issue.)

  

• iMac (Mid 2011): External features, ports, and connectors
• Apple Portables: Calibrating your computer's battery for best performance
• Apple Portables: About the "Ignoring accidental trackpad input" option on computers with the Multi-Touch trackpad
• About the "Ignoring trackpad when mouse is present" option on computers with a Multi-Touch trackpad
• Sync Services: Advanced troubleshooting for contact and calendar syncing
• GarageBand for iPad and Mac: Project compatibility
• iPhone: Attachment appears to be cropped in Mail when rotated

Wednesday May 11th, 2011

• Apple TV (2nd Gen) v4.2.2 Update Info (changes/fixes)
• T3 (short) review of 2011 iMac 21.5in
• 35-Year-Old Apple I Resuscitated At Italian University
• ($49 w/Contract) iPhone 3GS Outselling New Android Phones
• Truck thief thwarted by iPhone (left inside truck)
• iPhoto 9.1.3
• Cocktail 4.9.2 (Snow Leopard Edition) released
• Microsoft says latest Patch for Mac Office not ready yet
• (Blog) StarCraft II Patch 1.3.3 Now Live
• Music labels to Google: We're counting on Apple
• R.I.P. iFlowReader: How Apple Policy Crushed a Small Company
• Skype users expect more ads under Microsoft
• EBay to Make $1.4 Billion on Skype
• Aperture 3.x: Aperture unexpectedly quits if Final Cut Express 4 is installed (Apple)
• Mac mini: How to remove or install memory (Apple)
• Apple TV (2nd gen): Use the same Apple ID when enabling home sharing from your computers to Apple TV (Apple)
• Apple TV (2nd gen): No audio when using Apple TV (Apple)
• Apple TV (2nd gen): TV displays incorrect colors when playing content from Apple TV (Apple)
• About the Guest network feature of AirPort Extreme and Time Capsule (Apple)
• AirPort base stations: How to find the Wi-Fi network when it doesn't appear normally (Apple)
• OS X Snow Leopard: Exclamation icon displayed in AirPort Menu Extra after entering a WEP password (Apple)
• iMac: Memory specifications and upgrades (Apple)
• MacBook Air (Late 2010), MacBook Pro (Early 2011) and iMac (Mid 2011): Recovering a lost firmware password (Apple)
• How to identify MacBook Pro models (Apple)
• Apple Wireless Keyboard: Difficulty during pairing process (Apple)
• Mac Pro (Original): May not start up from some OS X media if using NVIDIA GeForce 8800 GT video card (Apple)
• iPhoto and Aperture: Printed Books, Cards, or Calendars appear with missing or truncated text (Apple)
• iTunes: Understanding the iPod Photo Cache folder (Apple)
• How to back up MobileMe data (Apple)
• About the "faster performance" dialogue in the MobileMe Calendar (Apple)
• Frequently asked questions about MobileMe Calendar (Apple)
• Magic Trackpad: Using Trackpad Handwriting with Simplified or Traditional Chinese (Apple)
• Intel Z68 Review - The Sandy Bridge Platform Expands (2011 iMac uses Z68)
• Acer Chromebook: A solid-state (16GB) Netbook for $349
• (PC) Portal 2 Authoring Tools Beta Release
• Invisible Touch Interface Creates Multitouch 'Force Field'
• Patch Tuesday updates fix a trio of Windows 7 SP1 glitches
• Google one-ups Apple with 5 percent payment fee
• Rumor: Google to Rent Chrome OS Laptop for $20/Month
• Report: Facebook Security Flub - Social Network Exposed Private Data to Advertisers
• Facebook denies privacy breach allegations by Symantec
• Social networks, mobile phones, and scams can threaten your security
• Google Releases Android 3.1, First Major Update to Honeycomb
• Google I/O Day One: 5 Coolest Apps
• BlackBerry PlayBook Apps: 8 Great Free Downloads
• Brink Updated (Steam)
• Security Firm Hacks Chrome: Escapes Sandbox, Evades Anti-Exploit Measures
• Yves 'Jetman' Rossy flies over Grand Canyon

Tuesday May 10th, 2011

• Notes about the 2009->2010 Mac Pro EFI/BootROM Updater (w/6-core CPU and 1333MHz RAM Support)
• Review of 2011 iMacs (21.5 and 27in)
• Senators Grill Apple And Google Over Smartphone Privacy
• Apple Got Us Touching Our Phones... Will It Get Us Talking To Them, Too?
• NewerTech announces $99 Battery for Late 2008/Early 2009 Unibody MacBook Pro 15in
• Portal 2 Update Released ("Improved MSAA rendering performance for Mac OSX")
• Drive Genius 3.1.1
• Microsoft to Buy Skype for $8.5 Billion
• Google takes on Apple with music and movie rentals
• Google Vs. Apple: 'Road House' Vs. 'Bourne' [Video]
• HBO Go off to a flying start with 1 million downloads
• Team Fortress 2 Update Released
• Atom Zombie Smasher Updated
• 'iOOTP Baseball 2011' Review (iOS)
• iMac: Fans run at full speed after computer turns on (Apple)
• iMac (Mid 2011), MacBook Pro (Early 2011): About resolution settings in the QuickTime Player inspector (Apple)
• Boot Camp: Use DVD or USB storage to install Boot Camp drivers (Apple)
• Using iPad or iPod with multiple computers (Apple)
• iTunes: How to set up an iTunes Store account (Apple ID) (Apple)
• ATT: How to set up a new Cellular Data account on iPad Wi-Fi + 3G (Apple)
• iTunes for Windows: Moving your iTunes Media folder (Apple)
• Asus Media Player Firmware Updates for OPlay (HDP-R1) and OPlay Air (HDP-R3)
• Now Available - Brink (steam)
• Source: Xbox 360 Spring 2011 update launches May 19, adds PayPal; Avatar Kinect coming May 27

Monday May 9th, 2011

• Upgrading 2009 MacPro EFI/bootrom to 2010 MacPro (w/6-core CPU and 1333MHz ram support)
• iMac (spring 2011) review
• New iMac review: It's awesome, but does anyone need a desktop nowadays?
• (Youtube video) 2011 Quad-Core iMac Gaming: Portal 2
• Imagining a future MacBook
• Violent Exchange at Apple's Beijing Store During iPad 2 Launch
• Apple is world's most valuable brand
• Go Behind the Scenes at Apple, Courtesy of Fortune Magazine
• OWC May Clearance/Garage Sale Updates
• (Sticky) The WoW Performance Guide For Macs
• Macs, malware and wolves: A follow-up
• Top 10 Fixes for the Web's Most Annoying Problems
• A few New Diablo III Screenshots
• Team Fortress 2, Counter-Strike: Source, Day of Defeat: Source and Half-Life 2: DM Updates Released
• Amazon Cloud Player Now Works With iOS... Sort Of
• Apple Hardware Test: iMac (Mid 2007) and later models (Apple)
• iMac (Mid 2007) and later models: About startup tones (Apple)
• Using a 27-inch iMac (Late 2009 or Mid 2010) as an external display (Apple)
• Intel-based iMac: Installing available updates (Apple)
• How to identify iMac models (Apple)
• How to identify your iMac (Apple)
• Apple TV: TCP and UDP ports and protocols used (Apple)
• Apple TV (1st gen) may not play content purchased from the iTunes Store (Apple)
• Catalyst 11.5 drivers available at AMD's D/L page, and Catalyst 11.5a hotfix (FYI for bootcamp users)
• Build It: A Sandy Bridge Media Machine
• OCZ Vertex 3 (240GB) Review
• $25 Computer to Entice Kids into Programming
• Hackers put Linux back on the PS3
• Someone May be Getting Your Online Bank Statements
• Thousands Of Google Images Infected With Malware
• Sony's PlayStation, Qriocity Services Remain Shut, 'Uncertain' on Restart
• T-Mobile loses record number of contract customers in 1st Qtr
• Report: EA Already Has New Xbox Hardware