Mac osx 10.6 froze at login to another user account now boots to blue

I am at my wits end and i'm hoping someone can help!!!
this is about the 5th time my mac has just frozen, eventually causing me to reformat, reload and start again, and that's in the past 3 months, i only bought the thing in january and this has been a regular occurance...
and of course it isnt the same problem each time... altho i am getting to know the keystrokes for booting up in the most obscure ways which some may consider a positive, i am finding the time i need to spend on this tedious and just plain frustrating....
so i have a macbookpro, it did have the latest version of snow leopard 10.6 on it, and i had obtained the new lion operating system but of course i havent had the opportunity to download and install because this has occurred twice since Lion came out...
i have spent a lot of time trying to get this to work...
this time i had three accounts one of which was administrative the other two held a variety of personal or professional documents on them, basically the admin one only had file downloads and computer 'stuff' in it,
all three were secured by fire vault and this seemed to be working this time, - although i did note that the time before this disaster i was unable to vault any of my accounts and when i tried to set up new accounts and secured them during the set up process i wasnt able to access them after they had been set up... (thats just an aside which may or may not be relevant, but thought i'd mention it anyway)...
the three accounts were pretty well organised and appeared to be functioning until last night when i was 'doing the right thing' and checking and repairing disk permissions in disk utility (apparently the system was expecting 0 but was getting 80 or vic versa) in the user account that had administrative rights, when i logged out of that account and attempted to log into another non admin account the screen went blue and it just sat there like that for an hour or so. in the end i turned it off and since then i have not been able to log in or boot past the blue screen....
the other thing that happened unbenownst to me was that although i did have the backup system set up in time machine to an external drive, when i tried to restore the only file i could find was this....... '.com.apple.timemachine.donotpresent' which has zero kb ... so of course i cant use the backup to restore the system and quite frankly i doubt that the mac would recognise it anyway, its not recognising anything that makes any difference to it at all...
i have tried everything but nothing works...
it wont boot from the CD which came with it - actually it never has successfully booted from the CD, but now it wont even acknoweldge that the CD is there...
other things i have tried include all the 'key strokes'
such as shift - for safe mode - nothing happens,
option to access start up manager but that stops at a lock icon which of course doenst open with any of my passwords, persumably because it's not booting to one of my accounts - but i really dont know...
i have tried single user and verbose, resetting the nvram, doing a 'dirty boot', trying to test the hardware, and a variety of other keystrokes which have been set out in various online forums but nothing happens.....
and NOTHING WORKS....
what does happen is that when i press the power button it comes on quickly there is no start up sound, the apple appears and then shortly after the circle thing appears and then it just goes to blue and after a few moments it goes black (like in sleep mode) and will stay there for hours if left until a key is pressed at which point it the blue appears again and so the cycle continues....
is there anyone out there who might be able to help i really dont know what to do next

If the system is getting to the blue screen it can be a startup item or application enhancer stopping the login process, also you mentioned a lock when you held option? this is most likely a firmware password set on the machine, to remove a firmware password you need to remove a stick of ram and do a PRAM reset, (hold command-option-p-r on boot). after this you should be able to hold option and boot from the install disc, or try other troubleshooting methods.

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Library/Fonts:
[A hole bunch, removed to shorten post...]
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Please read this whole message carefully, especially the warnings, before doing anything.
1. The changes to your configuration suggested here should be considered provisional; they may not solve your problem, or they may remove functionality that you find useful. If a third-party system modification that you want to keep is causing the problem, seek help from its developer.
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N/A
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