Dell inspiron 1545 problem

hi, ive had my dell inspiron 1545 for about a year & a half, recently its been freezing for about 3 minutes and then working fine again, but yesterday, i tried to run a regular scan & it froze so i had to turn it off by the power button, now, it wont come back on, everytime i try to turn it on a message comes up saying "there is a problem with the system that could of been caused by a recent change of hardward or software, then theres 2 options, LAUNCH START UP REPAIR (RECOMMENDED) & START UP NORMALLY.. ive tried both options on numerous occasions but it just wont turn on, the loading screen shows until i switch it off, could someone possibly help me.. does it sound like ive fried my hard drive? if so does anyone know if dell will fix it if its still under warrenty? thanks