I have mentioned this problem here: http://en.community.dell.com/support-forums/software-os/f/4677/p/19537504/20503019.aspx#20503019
But I thought it might be worth posting here, too.
My 10 year old daughter saved her money for 2 years to be able to buy her own laptop for Minecraft. We received it about two weeks ago. Today I ran windows update and installed the recommended and optional updates. While installing the updates, windows said it had encountered an error and needed to restart. Upon restarting it went into the endless loop mentioned above; "Checking Media - FAIL". I have found a few other forum topics here and elsewhere online that offer solutions, but I do not have an option to choose Windows Boot Manager, just UEFI Pvl4 and UEFI Pvl6 (or whatever it says). I am also at a loss as to where to find the serial code to contact Dell Support. There are no stickers anywhere on the machine.
If this is a hardware issue I assume that this should be covered by the warranty since the machine was purchased 2 weeks ago(?).
I should add that I did the diagnostic and everything appears to be OK. Any help is most appreciated!