I have a lenovo thinkcentre m73 desktop. Recently power supply unit(PSU) has been out of order so I needed to change that PSU.Shops near me does not have that PSU instead they told this model is out of the market may be. So you better change model of PSU. So changing PSU also needed to change casing and motherboard. Now my question is there any problem in the future for this parts-model mismatch? What measures should I take now if necessary?