Let me explain. My iMac 2.8 intel dual core, 2 gb ram, stock nothing has been done to it, only year old. It began to lag and lock up a lot. For example downloading a torrent would lock up until it finished. Watching videos on VLC would freeze towards the end or video stopped and sound continued on till it froze. I was limited to editing 1 photoshop file at a time and for a limited amount of time before the system began to freeze up. The general performance was slow and laggy at best. So I took these steps to TRY to fix it. 1st I was down to about 12 gb of free space so I deleted some videos and had a nice 50 gb available. Not better. 2nd I tried to back up my data, but transferring these files to a external hdd would lock up and certain files in folders in folders in folders wouldn't transfer. I hope you get my drift and with 250 of 300 gb used I couldn't do files 1 by 1 to find these certain files that for some reason didnt transfer. If i recall it was -32 error or something?! So not better. 3rd I wanted to reinstall os x anyway after I backed up. But since I couldn't back up I decided to do archive and install. I used my mac os x disc 1 that came with the computer selected archive and install, installed os x again no problem. Once os x finished, it restarted, then restarted, then restarted. Still not better 4th I tried to reset pram. Still restarting 5th I entered disk utility and repaired hdd then repaired disk. Still restarting. 6th I started to worry cause I don't have a back up of my pictures and I need this. I see through disk utility that the data is still taking up space. So i decided to try and use the restore option to create a copy on this external hdd. Instead I got this error "restore failure could not restore input/output error". 7th I came here for your help. My main concern is getting my data intact of course. My second concern is what cause this imac to slow down so drastically. I wasn't sure if i could do another install of os x since its probably already created the old system folder. I really need help on what to do next to keep my data and get the imac to load.