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I recently bought an LG monitor to use as a 2nd display but my iMac (mid 2011, running Mac OS X Lion) doesn't detect it.

It's connected using a Thunderbolt-to-HDMI-cable (which I bought from The Apple Shop the other day).
What could be the cause of this bad-detection behavior?

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Are you daisy-chaining any other Thunderbolt devices, or is the Thunderbolt-to-HDMI adapter plugged directly into the iMac? (if it's plugged into another Thunderbolt device, try plugging it directly into a port on the iMac) –  pmdj Nov 5 '12 at 12:29
Directly to the monitor... –  John Nov 5 '12 at 12:50
directly to the monitor, yes, but directly to the iMac? As in, is there anything other than the adapter/cable between the iMac and the monitor? –  pmdj Nov 5 '12 at 16:49
no.... one cable connecting the monitor to the iMac. nothing else in between. –  John Nov 7 '12 at 11:15

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