Hello everyone. I have a Macbook Pro 13 from the summer of 2009. After Christmas I decided to upgrade my hard drive and memory. This is what I got. http://www.newegg.com/Product/Produ...m_re=samsung_spinpoint-_-22-152-237-_-Product http://www.newegg.com/Product/Product.aspx?Item=N82E16820226019 For about a week everything seemed to work perfectly. I then began to have problems almost every day (finder crashing, etc). I reinstalled OSX probably 5 times using my previous account until finally did a clean wipe and reinstalled OSX again. It now seems to be working for the most part, but booting takes about two minutes. It gets stuck on the grey screen with the Apple logo with the turning gear for a couple of minutes before it boots. Normally it wouldn't bother me too much, but after the problems I was having before, I really wanted to make sure that there was no problem with my new hard drive or memory. After doing the usual suggestions for slow boot time (resetting PRAM, disconnecting external devices, repairing disk permissions, etc.) nothing changed. I booted into verbose mode and it seems to hang up for awhile before listing disk0s2 i/o error It does this twice before booting, hanging up for about a minute before giving the error. I am not sure if i should return it under warranty because I am not sure its broken. Like I said, it seems perfectly fine right now with the exception of the boot time. Using the Apple Hardware Check, even the extended check, didn't give any errors. The SMART status for the hard drive is verified. Is this clearly a hard drive issue, or could it be something else? Has anyone else had a similar problem?