I have a blue screen and no disks as computer is second hand

hi there.
I bought a second hand mac book pro from ebay last year as I had never had an apple computer before and wanted to see how I would go. I have been downloading movies and the computer was working fine. Last night the computer seemed to over heat and switch off. I am now trying to use the computer again and all I get is a blue screen and nothing else. it goes through the grey screen and then blue and then nothing. I don't have any start up disks is there anything I can do or do I have to take to the apple store to get fixed.

I have read your last two responses and I have no idea why COMMAND D would have any influence on starting the MBP. I also note that you have:
"Just tried:
Single user, safe mode, startup maneger, PRAM, and SMC."
I have the sense that you have windows installed on your MBP. This may or may not have some bearing on your situation. I do not have Windows, therefore I cannot say with any certainty.
If you have done everything that you mention above in the proper sequence I can only suggest reinstalling your OS. Will your MBP start up holding down the option key? If not, try OPTION/COMMAND R on startup.
You need an Internet connection to do this.
Is all of your data backed up? If not insert another HDD in the MBP.
You seem to have tried everything I can think of which has led me to this suggestion. Perhaps others can add additional options in lieu of taking this step. I am just out of ammunition.
Ciao.

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Exception state (sv0x29d85280)
Backtrace terminated - frame not mapped or invalid:
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Whoah boy, lots of things here and I have to make supper...
I'll choose a few at a time. "RAM drives"
RAM drives? Do you mean hard drives? Do you mean RAM chips?
If hard drives, did you put them back in the same order? Multiple hard drives in one machine often need to be jumpered correctly when you move them about.
If chips... It's too difficult at this stage to tell if it is hardware or software. If hardware it could be chips, and that error at the end had a vague chip ring to it. One way to test for chips if you have extra chips is to pull all but the minimum required to boot and see if it boots.
You mention a backup drive. This wouldn't happen to have a clone of the operating system on it would it?
4 drives... All internal?
From all you've said it could be hardware or software. Blue screen could be software but failing hardware can corrupt a drive, messing up the software.
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I have a blue screen and no disks as computer is second hand

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