how can i fix my acer t180 pc realy urgent?

hi,a every1. on my motherboard i have the amd sempron 3000 socket am2 and i removed it to try another processor but i dident realise i had to lift the lever to raise the cream/white plastic thing ,(the thing with all the tiny holes in) so i gentely pulled it off and while doing this i snapped the plastic cover and since i,ve put it back in my pc justs beeps and my screen wont come on. please help as i,m desprate. thanks