(Redirected) harddisk not detect

hi,

i have dell inspiron1525 n however on yhe point i was working on my laptop it suddently turn off n when i try to start it , it does,'t. i do dignosis test so it shows error n stop. then i see the boot menu where harddisk was detecting but laptop was not starting up. then i took out the internal hdd from laptop n connect it to another pc n take hdd dignosis test n it pass the dst tedt but show error in short generic test.  so now what can i do > i have some very important data in my hdd, and i dont have back up, is there any solution to this problem? if there so plz lem in knowits very important data to me....hoping for valuable solution..