hard drive not seen in my computer!!

i have just connected a western digital hard drive to my puter but the problem is that its seen in the device manager but not seen anywhere else!! i already have data on this hard drive so i do not want to format it!
i had partioned the same harddrive and tried to instail linux mandriva on it, could this be some of the problem?

  phono 01:04 11 Jul 06

Have you "let Windows know" about the new drive?

Click Start > All Programs > Administrative Tools > Computer Management > Storage > Disk Management, select your new drive and mark it as active.

See if that helps.

the hard drive is not showing up in disk management,just found out as well the computer will not boot up now with the harddrive connected! but when the power supply and ide are disconnected the pc will boot up ok!!

  phono 22:35 11 Jul 06

Is it a PATA or SATA drive? IF it is a PATA drive is it jumpered correctly, was the cable corrected the right way round and pushed fully home, also, is the PSU connector making a good connection?

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