Blank screen due to Harddisc

Blank screen due to Harddisc problem upon logging windows.
Upon logging the windows, i can see the windows icon flashing(loading), but after that i get a blank screen instead of the page asking me to key in my password. If i pluck out my 500GB Seagate Hard disc,i''ll be able to log in. my drive C is not in 500GB HDD. however, if i connect it back, i 'm not able to reach the page where i need to key in my password. thus prevent entry to my computer. i have a lot of important files inside my HDD. Please help me ... there is no words displaying saying i got errror. it's just a blank screen...

now i have try using my friend's personal computer... same condition .. Should i try it with USB connection? HOw can i retrieve the DATA back with minimal cost? THe data is all in the HDD n yet i'm not able to access it... ANy idea how to solve this problem? it's still in warranty till 2011 but my DATA will b gonei dont want trade a new one . PLease help......

since it's able to pass the windows's flashing.. is it considered cant access the BIOS?
please help..
i need to access my HDD. is it considered DEAD?