Some good advice has already been given but I will recap: first attempt to salvage any data that is wanted. Best way to do this is to remove the failing (failed) hard drive and try to place it in an external (USB/Firewire) case, whatever you have handy or can purchase or borrow from a geek friend. Connect this external drive to a know working system and see if the failing drive can be accessed by the working system OS. If you can see the folders/directories on the suspect drive, quick copy the data that is critical (to you) onto free space on the working system or DVDs or flashdrive, etc. Second, an oldie but a goodie and a personal favorite is "Gibson's SpinRite" hard drive repair utility. Over the last 25+ years since SpinRite ver 1.0" (now latest is 6.0) it has saved or brought thousands of hard drives "back from the dead", either to working condition or at least working long enough to recover critical data from them before they went belly up for good. SpinRite can be run on a regular basis to monitor the "health and status" of your hard drive as it ages. If SprinRite can't bring it back then you need professional help but be prepared to spend big bucks (thousands of dollars). Most of us don't want our data back at that expense, but for a company to recover their bookkeeping records, employee files, etc. the expense might be justified. If your hard drive makes no noises (doesn't spin up/power up, or load the heads out onto the drive sectors) then try the PCB board swap if you can locate the exact same drive type. Removing the drive platters (unless your home has a "clean room") is a losing proposition as the platter will become contaminated by dust or dirt and be damaged further. I have found at least 80% of the time I am able to read a drive once I have removed it from its native platform and into some external enclosure that I can connect to my laptop. I have move laptop hard drives into one of my laptop (either a SATA or EIDE) depending so that I can boot up my SpinRite CD and investigate the problem drive. SprinRite will even work on MAC/Apple formatted drives if they are removed from the Apple device and installed into a Intel desktop or laptop for troubleshooting. This is not a "plug" for the SpinRite product, just saying what one of the best "tools" I have in my toolbox besides a torx screwdriver set. I cut my teeth on Steve Gibson's "SpinRite" and Peter Norton's "Norton Disk Doctor a.k.a NDD) back when both companies started. Sadly only Steve Gibson is still standing these days. That's my two cents.