Mac on Snow Leopard keeps looping back to login screen

Hi, Everyone,
I have a MacBook, late 2008 It originally had 120 GB hard drive. Because I had less than 10 GB of space left, I replaced that with a 320 Western Digital Scorpio Blue HD (by myself, with an antistatic strap, etc). Everything seemed fine for a few days. Lots of space, immediate responsiveness with programmes, etc....nothing could be better. Then the system started getting sluggish, and I started getting spinning beach ball clicking between apps. Every time I ran verify disk permissions, there was a long list of permission repairs. Running repair disk never yielded a result other than everything being okay. I even created a flashdrive with the installation software. And I ran Onyx to try to clean things out.
Then a few days ago, after restarting my computer (I may have done an update, but am not sure), my computer slowly booted up, came to the login screen, I entered my password, my desktop appeared and it "hung" for about 30 seconds, then the screen turned blue and went back to login screen. I made several attempts to login, but always got the same result.
I used my bootable flashdrive (which I created with SuperDuper to contain the installation disk before I installed the new hard drive) to check and repair permissions. Each time I did that, I got the same permission errors. Again, nothing detected with disk verification/repair.
When I start up the computer in safe mode, everything is fine except Safari kept crashing.
Deleted and reinstalled safari to no avail. Still crashed. No problem in Firefox.
In the regular mode (not safe mode), I reinstalled Flash, restarted, then back to the looping to the login screen.
Still no problems in safe mode.
At first I thought there would have been something with the new hard drive, but everything works fine in Safe Mode, so I'm wondering if there is something with Safari or Flash.
I've updated ClamX and run a ClamX scan as well to check for viruses/Trojans.
Please help.
Help!

Monique Mayer wrote:
Okay, I reinstalled Safari under another admin account. No problems there, and --so far--no problems in my main account now.
What has happened is this.
You installed a new hard drive, it came from the factory with some bad sectors on the drive.
You laid your new OS X and data over these bad sectors and now having issues in various locations.
The drive automatically maps off these bad sectors when it gets a read request from something your using, however it takes some time before it realizes such is the case, (thus the spinning beach ball as OS X is waiting) then it moves the data to a new sector and maps off the old one.
Also as you use the computer, your writing data to new bad sectors on the drive, which haven't had their turn yet enough to be read and hopefully mapped off by the drive. This is why your problem appears to be changing as it goes on.
Look at your problem timeline:
Then the system started getting sluggish, and I started getting spinning beach ball clicking between apps.
This is likely a problem with the swap file which is stored on the hard drive when you run out of RAM memory with a lot of programs and files open.
The swap file was stored across bad sectors, which the drive couldn't read well and thus you got the OS X spinning beach ball effect.
This file location moves locations to free space on the drive, expands and contracts as you load things up to use.
Then a few days ago, after restarting my computer (I may have done an update, but am not sure), my computer slowly booted up, came to the login screen, I entered my password, my desktop appeared and it "hung" for about 30 seconds, then the screen turned blue and went back to login screen. I made several attempts to login, but always got the same result.
You have done a update, which added more data to the drive and/or triggered a response from OS X data written on a bad sector which has hung your computer.
When I start up the computer in safe mode, everything is fine except Safari kept crashing.
Safe Mode disables at boot software, video and other things so OS X is in a reduced state, the bad sectors are being avoided as their data is not being called.
Safari is crashing because it too is corrupted, which your later post you reinstalled it and now it's fine, because it was written to a clear space on the drive without bad sectors issues.
So your going about a "piece meal" restore method, next will be OS X, then all your programs, then a new user account because your User/Library will get screwed up etc., etc.
Instead of this long pain, just follow my first post instructions and it will cure everything in one clean shot
If the drive itself is bad and that's causing your bad sector problems, which you will soon find out and can get it replaced. The way your going it's going to keep giving you problems of various sorts for quite some time.
I also tried the SMART check and it passed--no errors or bad sectors.
That only provides a current bad sector count, which you say is zero, which is typical for a new drive as it hasn't read enough from the drive to find the bad sectors yet.
In order to really find bad sectors on the drive, software would have to continously read data written to the entire drive over and over and over again so the drive will finally "trigger" the mapping off process. This would take days or even weeks to complete on large drive, so obviously the software isn't doing this.
All drives come with a few bad sectors, the automatic mapping off process upon reads usually takes care of it, however you have more bad sectors than normal, which might have occured:
1: Higher than normal amount of bad sectors from the factory.
1: Bad drive from the factory causing bad sectors.
2: Your moving the computer while the drive is in operation that the heads struck the platters causing the bad sectors.
So a Zero Erase in Disk Utility, a fresh OS X install from the disk, fresh programs from original sources and vetted files from backup is the sure means to cure the whole mess. Bad sectors and data corruption.
The DU Zero Erase proceedure does a pretty adequate job mapping off failing sectors, it takes hours to complete and not days.
Bad sectors causes data corruption, so you really can't trust a previous clone or TimeMachine backup of this corrupted data to restore with (except vetted user files), some here have done that only to wonder why their problems returned after the zero erase was completed.
If you restored the new drive with SuperD from the earlier drive, you also might have carried data corruption from that drive over too.
So with a fresh install of everything, only thing that can be corrupted is your user files, which you restore from a clean backup and/or delete the ones causing problems.
Take care and good luck.

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You may experience unexpected results if you have installed third-party system software modifications, or if you have modified the operating system through other means. (This does not apply to normal application software installation.)
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Purchase the Snow Leopard Retail DVD.
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Insert OS X Installer Disc into the optical drive.
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Open Disk Utility from the Utilities folder.
Select the destination volume from the left side list.
Click on the Restore tab in the DU main window.
Check the box labeled Erase destination.
Select the destination volume from the left side list and drag it to the Destination entry field.
Select the source volume from the left side list and drag it to the Source entry field.
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You may experience unexpected results if you have installed third-party system software modifications, or if you have modified the operating system through other means. (This does not apply to normal application software installation.)
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Purchase the Snow Leopard Retail DVD.
Boot From The OS X Installer Disc:
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Restart the computer.
Immediately after the chime press and hold down the "C" key.
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