G50vt overheating

My notebook is overheating and I noticed that the fan is not spinning. I hooked up the fan to a 9 volt battery and it spins fine. The connector on the motherboard reads 5 volts so I'm assuming there's power to the fan.
How often do dc brushless fans die and what causes them to break down?
I should mention that the fan sometimes does start up but id say it fires up once every 5 times I boot the laptop. The fan is made by delta and the part number is kdb05105hb. I called delta here intoronto and they said theres a min order of 250... I also tries the asus estore website but could not find the part number in search. So Where could I order this fan from?

 

this ?
DELTA KDB05105HB-7F36 CPU Cool Fan+Thermal Paste Grease - eBay (item 310246333986 end time Dec-28-10 15:30:09 PST)

 

If you just need the fan a Forcecon DFS541305MH0T should work.

 

If the fan works when connected to a 9 v battery, would it be considered to be working correctly? What would cause it not to spin when connected to the laptop? I noticed there are 4 wires to the connector, red and black being 5v and ground, but whatare the yellow and blue for and what voltage should I be getting from these two wires? I would hate to replace the fan if it was actually something else causing it not to spin, possibly a motherboard issue?
Any help would be great thanks

 

Ha wow! You actually got them to acknowledge the fact that they actually make "KDB" series fans! I forget which location I called but they said that they couldn't find that fan in their database!

Holy moly thank you! I was trying to find an upgrade for my G50VT to improve air flow and I knew of this fan but I couldn't find the fan alone, it always was available with a new HS assembly for my laptop, which is $30+.

I couldn't find just the fan because I thought the last 4 digits of the model# was MHOT not MH0T! Zero

So, pchub has 3 different versions DFS541305MH0T parts

2 of which are 'bare' fans, and 1 of which is a 'round' fan. The 'round' fan is not the 0.5Amps that I have always seen this fan model# as, it is 0.6Amps and says 10CFM right on the label!
I hope it fits.
EDIT: Um, well it might just be 0.5A. The label on the website for the product shows 0.5A, but if I zoom in as far as I can on the image of the fan, it looks very close to 0.6A.

EDITEDIT:And the mold of the left fan, vs middle and right are different. I Believe pchub isn't labeling the items too well with 'bare' and 'round' since all the fans are round and all the fans are bare.
EDITEDITEDIT:: It is the right fan on that page. The fan left and middle one has 3 wires, the right-hand one has 4 wires, which is correct. I have ordered it and will see if it works out

 

ickibar123 I'm looking for something to cool my overheating g50vt as well! Would be good to hear how it goes with the fan.