Fan is alway running on my new dv7-4290us. Should I exchange for a new one or is this normal?

I just got my new dv7-4290us from the HP store and after a little while of playing with it, I noticed that the fan seems to always be running. It's not spinning very fast, just kind of a soft blowing or purring sound but audible for sure. Is this normal for this notebook or notebooks with quad cores and dedicated graphics? I called HP tech support and asked them if it was normal for the fan to run all the time, but they where kind of clueless with, 3 different guys giving me 3 different answers. I did mess around with some power management settings and the HP Thermal program but that didn't help. Turning off the fan always on setting in the bios just causes the fan to blow up every 20 seconds, so that is not a solution. There wasn't a bios update on the driver page, so I don't know about that as a fix. Otherwise everything seems to be functioning properly with no BSOD or lockups so far. The computer doesn't seem to be running hot (core temps stay under 50°c under light load) and the fan doesn't sound unhealthy like it has a bad bearing or anything. I just want to know if the fan always running at a low speed thing is normal on these machines. From my expereince with notebooks the fan alway running is a sign that your system is not cooling properly, so I wanted to get a second opinion from fellow users before I go through the hastle of exchanging this for a new one.

Does this happen on AC power only? There maybe an option in BIOS for 'Fan always on while on AC power'.
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