Macbook not detecting external HD

Hi,
My macbook just suddenly stopped detecting my 2 transcend external hard drives. It reads other devices eg card reader, ipod. The blue light on the HDs light up when i plug them in but the devices aren't showing in the volumes folder, desktop or disk utility.
I've tried the devices on other computers and generally they work fine.
Any ideas on how to fix this problem?

Are they all running the same operating system?

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Pcantin wrote:
I have tried another VGA monitor and that failed as well. Since you don't think the update was the cause, it may be that the adapter I am using decided to call it quits. I will see if I can find another and test that out.
I will look into the external drive idea as well.
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Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions...
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/Users/YourUserName/Library/Preferences/ByHost /com.apple.windowserver.<12digitHex#>.plist
/Users/YourUserName/Library/Preferences/ByHost/.GlobalPreferences.<12digitHex#>. plist
There may be more than one of each of the above, then trash...
/Users/YourUserName/Library/Preferences/com.apple.systempreferences.plist
Reboot
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To find out if it's system wide or user specific, try this...
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To find out if it's system wide or user specific, try this...
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