Macbook Screen goes blank

This morning I upgraded to iTunes 10.1. I decided to sync my iPhone 3GS running 4.0 OS, and my MacBook Pro screen goes completely black, like its in hibernation. When I disconnect my iPhone it goes back to normal. I'm syncing my iPad right now with no issues, so any assistance would be appreciated.

Hi Beddo,
      Thanks for getting back to me regarding this. Here are details from my system profiler:
Intel HD Graphics:
Chipset Model:          Intel HD Graphics
Type:          GPU
Bus:          Built-In
VRAM (Total):          288 MB
Vendor:          Intel (0x8086)
Device ID:          0x0046
Revision ID:          0x0012
gMux Version:          1.9.21
Displays:
Color LCD:
Resolution:          1440 x 900
Pixel Depth:          32-Bit Color (ARGB8888)
Main Display:          Yes
Mirror:          Off
Online:          Yes
Built-In:          Yes
NVIDIA GeForce GT 330M:
Chipset Model:          NVIDIA GeForce GT 330M
Type:          GPU
Bus:          PCIe
PCIe Lane Width:          x16
VRAM (Total):          256 MB
Vendor:          NVIDIA (0x10de)
Device ID:          0x0a29
Revision ID:          0x00a2
ROM Revision:          3560
gMux Version:          1.9.21
Displays:
Display Connector:
Display Connector:
Status:          No Display Connected
So it seems I have two graphic cards. The Intel one seems to be active. Could an inactive Nvidia still mess around with the system?
Many thanks,
vnayak

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http://bbs.archlinux.org/viewtopic.php?id=70733&p=1

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