Hard Drive upgrade to Compaq EVO 400C

Hello,

I am currently trying to upgrade a hard drive on a Compaq EVO 400C to an Western Digital WDScorpio EIDE 60GB hard drive and thus far have not been able to get it to work? Doesn't seem that the hard drive is being recognized by the system CPU/MOTHERBOARD? I can't see why the hard drive which is made for small laptops/notebooks should be incompatible? Wondering about the FAT and the larger capacity hard drive as well? Thanks!

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