Grey and Blue screen but computer won't start up and I don't have a start up disc

Help!
I cannot get my computer to start! Yesterday I was using powerpoint and the screen started to split in two and not repond. I turned off the computer and then grey apple screen on start up was striped, followed by a blank grey screen. After a minute the fan started to sound very loud but the computer would not start up. I did a safe reboot followed by resetting the PRAM and eventually the stripes dissappeared and it started normally.
Once it was turned on everything worked fine other than powerpoint. The split screen happened again when I tried to use power point, but it re-started normally and I forced power point to quit on re-start. It has worked all day without a problem.
This evening I left it open and the screen was black and unresponsive when I came back. I forced it to turn off but again I am faced with the stripey screen, then the grey screen of nothingness. A couple of times it's gone beyond that to a stripey blue screen.
I've tried re-setting PRAM, safe login in, and I've tried pressing command on start up to go in to the repair disc- it will let me pick the disc from the drop down menu but then goes no furhter than the grey screen.
My husband has lost my start up/ set up discs and it is nolonger in waranty. I also thought everything was backed up on Icloud but it doesn't seem to be there!
Is there anything I can do?! Please help!

Spaniel-Rose,
you can purchase a replacement pair of grey installation DVDs for your MacBook Pro from Apple or iFixit.

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Grey and Blue screen but computer won't start up and I don't have a start up disc

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