MacBook will not start up after first startup session

I absolutely have no idea what is going on. I have the most updated version of Snow Leopard for my '09 MacBook. I've done every trick in the book that came with my MacBook and even done the Hardware Test. I make it past the white screen with the apple, but as soon as the second start begins it just continues to stay blue. One thing I've noticed is when I hold down the C key (I believe it's that one) and have the Mac Os X disc installed, a giant lock pops up, but I have no clue what it's for. If it's a master password I definitely don't remember. Any ideas?

That lock is for a Firmware Password or a Master Password if you have FileVault enabled. You will need to get past that in order to do anything such as repair the drive or reinstall Snow Leopard.
Reinstall OS X without erasing the drive
Do the following:
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install the Combo Updater for the version you prefer from support.apple.com/downloads/.

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Since you are getting to the login screen, it is booting past the "gray screen" phase, so try the steps in this article, like a Safe Boot.
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
http://support.apple.com/kb/ts1417
You may also want to see if any of your Login Items are causing an issue.
OS X Mavericks: Open items automatically when you log in
http://support.apple.com/kb/PH14173
Thank you for visiting Apple Support Communities.
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An Archive and Install will NOT erase your hard drive, but you must have sufficient free space for a second OS X installation which could be from 3-9 GBs depending upon the version of OS X and selected installation options. The free space requirement is over and above normal free space requirements which should be at least 6-10 GBs. Read all the linked references carefully before proceeding.
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Macbook Will Not Start Up

My Macbook will not start up
I've had it about 5 years and around 3 years ago it started to go wrong with random shut downs so i took it into my local apple store and they replaced almost everything internally free under the special warranty i paid for.
since then its worked flawlessly, i dont use it often but did about a week ago to setup my new airport express (which wouldnt work from a pc)
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and the macbook dosen't work again.
sometimes it sounds like it wants to boot, the HDD spins up and the optical drive makes a noise but no screen and no chime.
sometimes it does the above and then seems to keep rebooting as the optical drive keeps making the start up noise it does on boot about 5-6 times in a row.
but on all occasions ... still no boot and no screen.
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MacBook will not start up after first startup session

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