TS3074 this is useless how am i to fix the problem when you dont even know

how am i to fix your software

Mac's do not have a BIOS to flash. Get your Mac back before this situation gets worse. Then take it to an Apple Store. You will have to pay.
FYI
"p/s I've increased the RAM to 8gb 1600Mhz Ddr3 recently"
You fitted the wrong Ram, you will need to change it for the right Ram when you get it back.

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