Compaq F750 Hard Drive SATA or what? Strange problem

Hi everyone. Thanks for reading my post.
I purchased a SATA WD Scorpio Black 7200RPM, 320 GB to replace the 120GB OEM Hitachi in my laptop. Researched it well (i thought!) and have still run into a problem.
While both are SATA drives the copper pins on the HItachi drive stick out with no plastic backer behind them and they kinda slide down into grooves on the connector in the lap top. Kinda snap together kinda of like you are interlacing your fingers.
The WD drive is standard with contact type copper pins and they don't make a conncetion. The computer says no hard drive.
The PN for the WD is WD3200BEKT
The PN for the HItachi OEM is HTS542512K9SA00. All the online pics I can find of the Hitachi show standard SATA but mine is definitely not! Odd ball stuff.
Anyone ever heard of this? I have pics but don't know how to link or post them here.
Any help would be greatly appreciated!
Thanks!

Remove the adapter from the pins of the Hitachi drive to use on your new hdd.
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ToddMusic wrote:
note: I also "dusted" the inside of the mac very carefully and lightly with a barely damp rag.....
Are my Hard Drives safe in there?
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simon.goodwin wrote:
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