Thread: computer screwed up, "dd" command related?

i screwed computer badly.

whatever reason, chose copy-paste on internet terminal (it said make game work), , when didn't work used "sudo" (looking back, realize how stupid was) 5 minutes later, browser stopped working, restarted , wouldn't turn on.

don't remember was, remember part

code:

dd if=/dev/sda

and, looking found think

code:

dd if=/dev/zero of =/dev/sda

i don't know of means, site found on said "zeroes out disk partition"

there way fix this? can run on livecd, want know if there way recover of files (mainly ones in home, don't have else on computer)

when turn on, goes past bios screen (it says lenovo) , blank screen.

livecd slow heck, can re-install os no problem (i think) want home folder

also, of music, movies, etc. on external hard drive , they're safe.

appreciate help.
ubuntu 10.04 lts

it seems if have overwritten content of hdd (/dev/sda first hard disk) zeroes. depending on how long run, has killed more or less on hdd. there special programs recover deleted or overwritten files

http://lifehacker.com/393084/how-to-...-free-software

or of professional service.

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