My Hard Disk Died.

I have the following hard drive: Hitachi Deskstar Model: HDS722516VLSA80 P/N: 14R9463 MLC: BA1254 Manufactured Date: Jun 2005 It just died suddenly with a blue screen. When I restart the pc, it is not detectable by my motherboard anymore. I check bios setting to no avail. I tried using another pc to boot also failed. I can hear the drive is spinning and it doesn't have any clicking sound. So finally, I tried using USB enclosure to read the drive, it detects the drive but I can't find it in my computer as well as disk management. I did a search from Google and read a few advices. I install SeaTool and it scans and detects my drive but it doesn't show any model number etc. Drive status says "Ready to Test". I tried all tests and all return with a message "Test Unavailable". What should I do? Should I replace the PCB board? I can't afford for data recovery service. Any help will be very much appreciated.