Hello, I have a Sony Vaio Desktop PCV RX752 and it began acting strangely a few days ago: stopped connecting to network and DSL, began to show odd type sizes on the desktop, would only work if I booted in Safe Mode. A couple of times I got a message that Taskmgr.exe wouldn't work so I couldn't reboot. Had to turn off manually at the switch. I backed up most of what I needed onto DVD. Worked but took about 2 hours to do 4 gigs each time. Today it went into sleep mode, then wouldn't come out of it (appropriately, I guess). I finally had to unplug it to turn it off thinking I could try Safe Mode again. Now it is totally dead. No response, doesn't come on at all. I'm guessing mother board. Been through hard drive failures in the past. This doesn't seem like HD. My question is however, how do I know what replacement mother board to use (just order same one?) and does it mean I've lost my hard drive? Can I just replace the mother board and continue with the existing HD, provided it's not hosed too? Thanks for any help you can offer. U.