Please help asap brick lg optimus s

[mofade]

okay i did something stupid i tried to install cm7 onto my lg optimus and now it wont start up please help all it will do is when i power it on is show the lg logo then the sprint logo after that the screen blink and show the lg logo for a quick second please help me fix this and it wont boot into recovery i tried up rocker home button and then power it wont work its just show a black screen when i tried it please help me out ASAP I need a way to reset everything by pc because the up volume home and lock combination wont work it just show lg screen for a second and then a blank black screen