External Display Incompatibility

I recently upgraded to Snow Leopard (all software updates completed-10.6.1), and ever since, my external display (22" LG Flatron W2252TG) has been looping in and out of power saving mode. I am using a vga cord with a mini displayport to vga adaptor, and a late 2008 macbook (first version of unibody macbooks).
If I have the display plugged into a power outlet, and the vga cable plugged into the display, the screen says "check signal cable"...makes sense. However, when I attach the mini displayport adaptor (Firmware 1.0.3 or 1.3, I'm not quite sure), to the other end of the vga cable, the screen immediately says entering power saving mode. However, it never actually goes into it. It just turns the bulb display off (but the power light is still on), and then comes back to the message about going into power saving mode, and keeps looping.
The monitor works fine on any computer that doesn't require the mini displayport to vga adaptor, so I'm sure it's not the vga cable.
Also, I have tried all combinations of connecting the screen. I booted it in clamshell mode, not in clamshell mode, and attaching the screen after boot.
My only guess is that there is some incompatibility between snow leopard and the mini displayport to vga adaptor. Is anyone else having this issue? I called AppleCare and they of course blamed it on the monitor, but it works fine in several other computers (as long as the adaptor doesn't have to be used).

I have the same issue.
I'm using MacBook White (Mid 2007) and external Samsung SyncMaster 205BW (at least I've been using…). My external display is connected via DVI and MiniDVI to DVI adapter.
The symptoms are the same.

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