The 4x bop is try to focus laser spot on BD layer - no laser, no focus. AFAIR the procedure starts with (visible) blue laser, if that fails it tries (invisible) infrared laser to check for CD/DVD. If you have set your drive to disc-loaded state you can remove the magnet and disc and you should be able to see seek and focus every time after dis- and reconnecting power supply.
You could try a mobile cam to view IR laser, they normally are bit sensitive to IR - you can probe that with a TV remote control. If IR laser work you could try whether an audio CD is accepted by the drive. If so chances are very good that a new laser unit will fix your problem. Otherwise there might be a risk that the problem is related to controller board also (maybe power supply).