Find out the manufacturer of your hard drive, download their bootable CD, and use it to do a low-level format of the HD. Or use something like DBAN
http://www.dban.org/
Did you install the OS after zeroing it? If so, the dates on a lot of the files will be old. Or are you still booted from the CD? If that's the case, you may be seeing a virtual RAM drive the CD sets up to let you boot from it (I think that's how the OS X disk works).
Network activity on your modem/router is normal. If you have a properly configured router it should block everything incoming.
I doubt your computer has been hacked.
http://www.dban.org/
Did you install the OS after zeroing it? If so, the dates on a lot of the files will be old. Or are you still booted from the CD? If that's the case, you may be seeing a virtual RAM drive the CD sets up to let you boot from it (I think that's how the OS X disk works).
Network activity on your modem/router is normal. If you have a properly configured router it should block everything incoming.
I doubt your computer has been hacked.