I have this problem with my pc. I can start the pc, I have acces to BIOS but there seems to be no power to the components. DVD-ROM doesn't work anymore, case fan and cpu fan don't work and yeah when the windows loading screen comes, it just stays there like forever. I noticed it's the PSU not giving power to components (HDD,DVD,fans) and tried to connect a white power cable from another pc with my hard drive and i saw that windows would start but why would windows boot or do a POST but with no working components?