New Hard Drive not working kinda...

changing the jumper wont affect performance any, you just have to make sure your MB supports sata300 (not all motherboards do, which is why theyre defaulted at sata150 by the manufacturer)

but, if you go to 'run...', and type in 'diskmgmt.msc', youll open up the disk management console... if anything, it sounds like the drive might not be initialized or formatted... if thats the case, all youll need to do is initialize and format it, and then youll be able to access it from my computer as a normal hdd

I don't see it.  

try removing the hdd from the external enclosure, and connecting the hdd directly to your motherboards sata connectors, that way youre bypassing the external interface, whether its usb/firewire/esata... which also eliminates it as a possible problem

check your motherboards bios settings too, the necessary setting to detect the hdd might be disabled

also just in case, put the jumper back in the hdd to set it back to sata150

I agree with Bass. Something else to add though, do you have any mapped drives on your system? Windows likes to try to bring up usb drives with the same drive letter as your mapped drives, and when it doesn't work, it doens't give you an error or anything, so see if that's maybe happeneing.

-The String

8O Sorry I see it now I did not have it turned on  

Most difficult problems usually have the easiest solutions