2008 MacBook Pro won't boot beyond Apple

SSo I have a 2008 MacBook Pro (a1261) and I recently upgraded my ram to 6bg and my hard drive to 1tb soil state. All has been great for about 4 months no problems then suddenly one day it crashed (for only the second time since I've owned it) due to what I assumes was over heating (I saw my thermometer say 84 degrees c before it went black) and now it wont start up, it turns on I get the tone and the grey screen and we get to the apple, it loads about 30% then shuts back down. It wont start up in safe mode or in diagnostics mode and I have no idea where my so disk is -_-' . I'm out of ideas as to what the problem could be, do you think I fried the motherboard? also the original Hardrive was wiped so putting that back in is pretty ,ugh a no go, and same with the ram I misplaced one of the chips. i seriously hope the upgrade isn't the problem esp, since it was working great for months