Can't mount my external Hard Disk

I bought a new mac book. I have been using an external Hard Disk with the laptop i am currently using. I tried to connect the 160GB external hard disk to my mac and it doesnt mount. It worked well for the very first time I connected, but then it showed up some error msg that the disk has been ejected improperly and the data might be lost. It doesn't even show up in the disk utility after I connect it. It works fine with my thinkpad though. Could someone help me with this....
Help is greatly appreciated....

hi there--
try an smc reset of the macbook http://docs.info.apple.com/article.html?artnum=303319 and then see if the drive is recognized then. if not, then try a different port if there is one available, or try a different external device with the same connection type to see if all devices with that connection type aren't recognized. good luck.

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