I'm trying to fix the fan on an Alienware 17 R3 where the original was making a grumbling noise. Went looking around for one with exactly the same number code on it and finally found one on Ebay - which took nearly a month to arrive from China. When it got here, it was nearly a two hour job to put it in because the GPU fan is buried in the machine and requires a full disassembly including lid off and motherboard out - only to find that it makes this really annoying sort of soft whistle when it's spinning up. So then I had to wait another 3 weeks for the seller to send a replacement out, another hour and a half to change that one in, and lo and behold, it also makes the same stupid whistle when it's spinning up. Are these likely to be knock off parts? It's ridiculous how much time and effort I've put into getting hold of a replacement fan only to be in the same position I was when I started.