Did you buy 204 pin laptop dimms when you need 240 pin desktop dimms or vice versa?
Not 100% sure, but I don't believe so. The width of these new modules is precisely the same as the one that is working in my machine. Secondly, the laptop dimms I have seen are more than double the height of these PC dimms, which is not the case with these modules, though I do see a strange "protective metallic sheet" that covers both sides of these modules. This sheet is not present on the module that is working.
Did you flip the chip around and try to insert it again?
Yes, I have tried that, but that takes the cut even more away.