Well I received my refurbished 27" i5 about two weeks ago. Since taking it out of the box it has consistently rebooted itself and sometimes even shuts down where I can't power it back up unless I remove the cord from the machine and reinsert it. I tried everything to troubleshoot, zapped PRAM, Reset SMC Controller, logged times after removing USB components, ran multiple quick and full hardware tests. Finally I gave one last attempt and wiped my drive clean and reinstalled snow leopard...Not a single one of these measures worked. So today I finally called applecare for the first time ever. THey were extremely helpful, didn't try to walk me through troubleshooting steps since they understood that I already tried them all. They instead stated that since Im at around 28 days since ordering (may 14) that I can have it repaired or they can claim the one I got as DOA and ship me a brand new one. Once I receive the new one I ship the old one back. They also bumped up my delivery to overnight since I have been putting up with the reboots and trying to troubleshoot myself. WOW!!! First time using applecare and I was impressed....just thought I would share. Hopefully I don't get another bad refurbished machine, this is the first time going refurbished route.