Here's the hardware info on the Mac: Hardware Overview: Model Name: MacBook Pro Model Identifier: MacBookPro3,1 Processor Name: Intel Core 2 Duo Processor Speed: 2.2 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 4 MB Memory: 4 GB Bus Speed: 800 MHz Boot ROM Version: MBP31.0070.B07 SMC Version (system): 1.16f11 Serial Number (system): W87410NQXAH Hardware UUID: 00000000-0000-1000-8000-001B639B081D Sudden Motion Sensor: State: Enabled Intel High Definition Audio: Device ID: 0x106B00A0 Audio ID: 44 Available Devices: Speaker: Connection: Internal Headphone: Connection: Combo Internal Microphone: Connection: Internal Line In: Connection: Combo S/P-DIF Out: Connection: Combo S/P-DIF In: Connection: Combo NVIDIA GeForce 8600M GT: Chipset Model: GeForce 8600M GT Type: GPU Bus: PCIe PCIe Lane Width: x16 VRAM (Total): 128 MB Vendor: NVIDIA (0x10de) Device ID: 0x0407 Revision ID: 0x00a1 ROM Revision: 3175 Displays: Display Connector: Status: No Display Connected HP w2207: Resolution: 1680 x 1050 @ 60 Hz Pixel Depth: 32-Bit Color (ARGB8888) Main Display: Yes Mirror: Off Online: Yes Rotation: Supported I was running Parallels 4.0.3048.450204 and upgraded to 5.0.9220.531002 upon completion of the install I rebooted as directed. I launched my Windows 7 VM, Parallels automatically updated Parallels Tools and rebooted. Upon reboot there is no sound, the speaker icon has a red "X" on it, and the message "No Audio Output Device is installed" is displayed when I hover the cursor over it. I've tried reinstalling the tools, looking for an updated driver, trying the Realtek driver, removing and re-adding the sound hardware in the VM and still nothing. Any ideas?