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I have the same Macally hard drive enclosure and I misplaced my power supply also. I used an old IBM Thinkpad power supply. These are common and cheap. The Macally enclosure states 12V DC input, and the Thinkpad PS is rated at 16V but it works fine. The plug and polarity are correct.
You are not giving a lot of information (like what operating system you are using, what privileges your account has, etc). However, it sounds like a permissions issue - make sure you are logged in as an administrator.
Also, if the drive was originally encrypted, you may need to have your login account set up with the same user name and password that the old drive originally had in order to access the files.
I would sure enjoy helping you figure your problem. I've taken Electronic courses in the Navy and in college, so this shouldn't be too hard.
As far as the capacitor goes, manufacturers make several different products from the same PCB layout, just some don't have all the components. Once I see where the capacitor should be I can tell you if its necessary or not.
For the fuse, it sounds like there is a short somewhere further in the circuitry. Rather surprised it blew right off the bat, but people and machine alike can make mistakes when building things. I fixed a laptop power supply where they didn't even solder the source resistor for the switcher.
Upload your pictures, and we shall we what we can do with it!
I have the same problem with the same enclosure. I found out it is the power supply problem. It worked the first time out of the box. But when the black 12V/5V power supply box heats up, if I turn it off, and on again, my hard drive won't spin up. It had buzz sounds and tried to spin. I think they use a crappy power supply that can't supply enough current during drive spin up when temperature goes up.
My solution is to unplug the whole unit from the wall when you don't use it. That give the crappy power supply time to cool down, so next time when you turn it on, it'll start from cold. This solutoin worked for my 300G Seagate drive. For my smaller WD drive, it doesn't require cold start. I guess it makes sense, as bigger drives require more current to spin up.
You do not need to install a driver for Windows XP and Vista, it is already built in. The CD may however contain optional software for initializing the hard drive the first time, and for making backups later.
Do you know if the hard disk is good? Does it spin up when you turn it on? You can hear and feel it spin up.
If this is not a SATA drive, make sure that the jumper is set correctly. Most enclosures require the drive to be jumpered for Master, sometimes for Single or CS. Check the top of the hard disk for a guide to how to set or remove the jumper.
You might try connecting it to different USB ports, some are faulty.