I have checked all the points in the "boot sticky" before writing here.
I bought my first Pi in January from RS (Pi-1) and used it successfully with an 8GB Class 6 SD card (SD-1). I liked it so much, I bought a second Pi in February (Pi-2) from Farnell/CPC.
I downloaded the latest NOOBS (v1.3.4) and booted Pi-2 with a new 4GB SD card (SD-2) for the first time last night. At the "Choose OS Installation" screen, I couldn't select Raspbian to install because SD-2 is not large enough. The second partition it created is too small to now fit Raspbian on it.
After 5 minutes of staying on this screen, wondering what to do, without no 'Cancel' or 'Exit' option, I pulled out the power cord from Pi-2 and then removed SD-2.
Luckily, I have another 8GB card exactly the same brand and spec as SD-1 (SD-3). So I formatted it and installed NOOBS on this as before. I plugged SD-3 into Pi-2 and put in the power cord, but there is no activity on the ACT LED. Just the red power LED is on, and nothing comes on the screen. I left it for 5 minutes and then pulled the power again. Seeing as SD-1 is already successfully configured and works perfectly in Pi-1, I tried it in Pi-2. Still, no activity on Pi-2.
I even tried SD-3 in Pi-1 to see if SD-3 was damaged, but it started the initial OS selection and installation successfully.
This points to the Raspberry Pi being dead.
Having tried the steps in the "boot problems" sticky, what do I do now, before returning this to Farnell?