Hard drives not showing up need to reset the access??? how do you do that

i have an internal hard drive & an external hard drive and in the info section of both it was changed to no access. I tryed to change it back to read & write but when i close it out and go back in the info it still says no access. I tryed restarting the computer but no the 2 drives aren't showing up on my desktop. how do i change those permissions so i can get access to my hard drives??? please help

Choose Go to Folder from the Finder's Go menu and enter /Volumes/ as the folder's location. Next, open the Terminal in the /Applications/Utilities/ folder while keeping the Volumes folder open. Type the following into the window:
chmod 755
followed by a space. Drag one of the volumes in question into the Terminal window and press Enter; repeat this with the second volume. Log out and back in.
(10922)

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Hello,
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Hard Drive not showing up

Hi all. I've got a macbook pro 13-inch unibody that has a boot up problem. It was fine until a couple nights ago when the laptop slipped off my wife's lap and onto my arm. it wasn't a big fall but i got shocked by the heat so i accidentally hit the laptop and so began my problems. immediately after, the movie we were watching froze up constantly and so i restarted only to find the folder question mark. i booted up in target disk mode and tried to repair the disk using my other mac. disk utility couldn't fix it so i though maybe it was time for a HDD upgrade. the next day when i tried to salvage the files, the drive couldn't be seen anymore by either the boot cd or my other mac. so i replaced the hard drive and now, it doesn't detect the internal drive i put in at all. i took the new drive to a local shop to get it formatted and partitioned guid for os installation but when it was put back into the laptop, still no go. in between the original drive failing but still read by the laptop to not reading any hard drive at all, what could have transpired? i'm a bit lost as to what could've happened and whether i need to replace the HDD cable or (god forbid) the logic board. any help at all will be much appreciated. thanks!

@cmcsk they offered to format the disk for free in case my laptop was just not reading it due to it being unformatted. so the new drive was fine and it was successfully formatted. anything beyond that will incur a charge. since i feel capable of replacing parts i just was hoping to find out if this is just a boot issue getting the laptop to recognize the drive, if there are any startup sequences i can do to reset the brain of the laptop or is this sounding like a parts/hardware issue. i guess i'm hoping it's a reset thing because i haven't done anything from the time the laptop could still see the old drive (tried to repair it and no go) to not seeing any drive at all.
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Go to Device Manager, uninstall the USB hard drive,
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Open Registry Editor, navigate to the following item:
HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices
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1)
Click Start, type: cmd in the Search bar.
2)
Right Click cmd and click Run as Administrator.
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Type the following command:
Copy [source] [destination]
Best Regards
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Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”

External hard drive not showing up on the desktop

I have a external hard drive and
when i turn it on the icon for the drive does not show up.
I used disk warrior and it found sever damaged sections of the drive.
i fixed that and it is still not mounting. Should it get a new hard drive?

Hi Josh,
I used disk warrior and it found sever damaged sections of the drive.
Did it repair them? If you run DW again does it report it as OK?
Open Disk Utility & see if it shows up there, if so highlight it & see if the Mount button/icon mounts it.

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Weilishu wrote:
Thanks for the response. However, I'm not sure what you mean.
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JGG

Hard drives not showing up need to reset the access??? how do you do that

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