Monitor ghosting

I bought a Samsung 2493HM less than 2 weeks ago, which is a monitor with a 5ms response time, and by what I've read, shouldn't have any ghosting.
But I started playing a game called Spore and there is ghosting in the game, which makes it hard to look at the screen at certain moments in the game. The thing is, I don't know if this is a monitor with a bad panel and I should return it or if this amount of ghosting is normal.
Does anyone have this monitor and does it display ghosting?
Is there a test that I can do to verify if it is really a faulty panel and compare results to others with the same response time?
It's connected through DVI to my Geforce 8800GTS 512mb.

Please help, deadline to return it is Tuesday and I need to be sure if it's the right thing to do, thanks!

nope...not from the cable, just tried with a vga cable and same amount of ghosting

Normally its cable related.

Another is if your display is near to strong magnetic field equipment or environment.

Another is high emi electronic equipment just like a poorly grounded/shielded PC. That includes your power supply.

Cheap fans is also cause for high electrical noise that creates problem on the display.

Can you move your PC away from your display and see if changes anything.

If you can't figure it out return the display and get a new one.

The problem coulbe your monitor....Have it replace

I don't have any other cable, but I'm going to the store today and compare it with another monitor and try with other cables. I hope it's just a cable problem, anyway, he'll replace the monitor if it's a panel problem.