it stops at turn on
the screen is always black and the fans go very quickly
crwdns2934109:0crwdne2934109:0
the screen is always black and the fans go very quickly
crwdns2934109:0crwdne2934109:0
This is the "panic mode". The computer doesn't know what to do and revs up the fans as a safety measure. Usually, with these line of Macs it boils down to a faulty graphic chip and/or bad caps on the logicboard. Please read the other posts related to this problem.
crwdns2934105:0crwdne2934105:0
+ do a search for "capacitor"
crwdns2936751:024crwdne2936751:0 0
crwdns2936753:07crwdne2936753:0 1
crwdns2936753:030crwdne2936753:0 12
crwdns2942667:0crwdne2942667:0 875