RichSumwalt wrote:
Now all I get is a white screen with the Apple logo and the gray timer circling.
If you get the gray apple logo with the progress indicator gear turning, then your computer is actually seeing the hard drive and is trying to load the system. (If it wasn't seeing the boot volume, you would be getting a flashing icon of probably a broken folder or something similar from the firmware.) That's a start, in any event.
There are a couple of easy things to try. First and foremost, do a PRAM reset by holding down the cmd-option-P-R key combination at boot until you hear the second chime. Second, you should try a "Safe Boot" by holding down the shift key while booting. This will make a run at repairing minor problems in the boot volume by running fsck (a Unix file-system check and repair command) and then loading only a basic set of Apple kernel extensions.
Not saying this will work completely, but often it does. The next thing to try would be a verbose boot by holding the cmd-V key combination at boot until you hopefully get to a Unix terminal screen where the system reports what it is trying to do. If you get that far, then there is information there that might be helpful.
RichSumwalt wrote:
I noticed now that the Hard-drive itself has a louder than usual fan sound.
You are probably actually hearing the computer's fans ramping up to full speed when the system has not loaded and taken control of the machine. This is a safety feature built into the PMU/SMU.