Mac Book Pro just replaced hard drive, new drive isn't showing up

Hello I have a mac book pro that had a Hitachi 320GB drive and it failed so I purchased a Seagate 500GB SATA drive and it's not showing up in the disk utility .... Any suggestions
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Could you please be a bit more specific. What are you booted from? Presumably not the new drive as it is not formatted, and not the old drive as it has failed.

Are you sure the cable on the new drive is firmly pushed in?
Deerek11Author Commented:
It's a new drive the old drive keep giving me the folder flashing with question mark I took the drive out and put it in another system and couldn't recovery most of the data so I got a new seagate 500GB installed the new drive booted to mac os x install dvd then went into the disk utility and the newly installed drive is not showing up ... Should I take it out and partition it with another computer or??
You could try that, but it sounds like there might be a problem with the drive cable in the computer. Try reseating the cable first.
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Deerek11Author Commented:
I just opened it back up and ensured the cable is firmly attached to the drive
Do you have an external USB case to put the drive into? Try connecting it by USB and see if DU sees it then.

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Deerek11Author Commented:
crazy I plug the new drive into the enclosure and it shows up in the disk utility .... Does this mean the cable is bad?? Is this something I can easily fix?  Also I just found another sata drives and connected it inside of the mac book pro and that one does't show up.....
Bodhi NadlerLead Mac DaddyCommented:
Yes. that cable can go bad.  You can find a new one on Amazon.  Try searching for the part number you see on the cable and there are probably a few options.
Bodhi NadlerLead Mac DaddyCommented:
Here is a link to one I recently purchased.  Make sure you get the right one for your machine.  

By the way, your 320 GB drive is probably fine, if you were experiencing an issue that made you think the startup disk was not being found (missing folder icon shown at startup).
Bodhi NadlerLead Mac DaddyCommented:
It is also possible that you only plugged in one cable. Disks usually need to have 2 cables, one for the data and the other for the power (unless in your PC a single cable holds both, which is unlikely). So make sure all cables are plugged in, and also make sure the other end of the cable is plugged into the PC's mainboard.
Only one cable in MacBooks, Rindi.
If you choose the correct model of your MacBookPro at the iFixit site, it will give you the part number for the ribbon cable and a link to purchase one:
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