inspiron E1405 winXp Home does n't boot "PBR2.....done.

Hello...

after first dell Bios screen where I see F2 and f12 options to go boost sequence

or setup...I see ...."PBR2.....done" message..and then again first dell bios screen...agin and gain in loop

even if i follow if menu same reasult..

All diagnostic  tests are ok...no error reported in HDD...

i have not tried ctrl+f11 coz i don't want to loose my data in disc...

pls.Can ny one help me solving this issue...

thanks

joy