Dell :: 2 New M1330's, One's Dead After 1 Hour Of Use

So I ordered 2 of these fine laptops, one with the NVIdia 8400, and one with the built in graphics. The one with the built in graphics will no longer turn on at all, it was used for at most 1 hour. Push the power button, it lights for 3-4 seconds, then goes off and you can hear a fan spin down. Holding the Fn key on start up shows all three LED's on solid, and then it shuts down after 3-4 seconds. Pulled/reseated/replaced the ram, battery, wireless, and hard drive. Dell tells me its a dead mobo. So how much should I be scared of a dead mobo after 1 hour of use? Should I let them replace it through their Next Business Day onsite service (which now they tell me will take 2 days), or just send the junk back? My 21 days ends on the 18th.

On the other M1330 with Nvidia graphics, I have not had any issues, with one exception. If I have it on, once in a while I will hear this loud creaking sound, not sure if its the keyboard or not. It sort of sounds like the sound made when you replace the CPU cover panel, so maybe something is just screwed in too tight and its thermal expansion of some sort?

Both laptops have dents in the aluminum palm rest, above the upper left corner of the trackpad. I googled for this and it seems its an over-tightened case screw, so I have backed those 2 screws out a bit hoping it will help.

I'm really not all that impressed at this point with the one laptop. A total mobo failure in 1 hour of light usage (literally just set up favorites in IE and downloaded/installed a few vista updates) seems very shoddy to me.