hi guys, first time posting here so go easy been struggling to find a way of reviving my 15" macbook pro mid 09 i7 after trying to update to the latest version of el capitan it just will not boot up any more. it will turn on, get to about 40% of the loading bar, go to a white screen and eventually cut out. my first port of call was to google the f*ck out of it. these are the things i have tried: boot in recovery mode - wont reach disk utility start in safe mode reset the NVRAM reset the SMC boot in single user mode and entered fsck -fy (after few goes it said everything was ok) booting in verbose mode (mac got rather upset and came up with messsage saying it was killing the cpu and shutting down in 3 seconds) none of this worked so I went for the reinstall osx aproach. I took the hdd out and pulled off all the files I wanted through plugging it into another mac (which worked fine). tried doing a clean install of el capitan by booting it through USB and pretty much got the same response although now loads to about 70% before doing the same thing. (white screen and turns off) tried the same thing but booting off an external hdd - same result. tried putting the el capitan installer on an old hdd and plugging that straight into hdd slot even tried booting snow leopard but got a recurring three beeps. (i think the version of SL is to old for my mac) all this makes it look like there is a hardware fault other than hdd? has anybody got any suggestions? thanks in advance!