URGENT!!! external hard drive not readable in Finder

I have a G-Raid external hard drive. Yesterday I accidentally plugged out the cable while it was connected to the iMac. there was usual notice that "the disk was not ejected properly". What happens now is that whenever I plug it back via Firewire 800 it doesnt appear neither in Finder nor disk utility. But when I plug it vby USB 2.0 it works... help me what to do, I appreciate it
Message was edited by: vladog

Hi vladog
Welcome to Apple Support Communities
You may have tripped the FireWire overload protection when you disconnect or reconnected the Drive.
Eject and disconnect all peripheral devices FireWire and USB, then reset the iMac's SMC.
http://support.apple.com/kb/HT3964
+1. Shut down the computer.+
+2. Unplug the computer's power cord.+
+3. Press and hold the power button for 5 seconds.+
+4. Release the power button.+
+5. Attach the computers power cable.+
+6. Press the power button to turn on the computer.+
Then test the G-Raid by reconnecting it to the FireWire port.
Dennis

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