you can either buy a Hard drive and reinstall windows (or reinstall windows to orig drive)
if a reinstall of windows does not fix problem
possibly a bad power supply (replace)
if new supply does not fix, replace motherboard
you can either buy a Hard drive and reinstall windows (or reinstall windows to orig drive)
if a reinstall of windows does not fix problem
possibly a bad power supply (replace)
if new supply does not fix, replace motherboard