Weird computer problem you have there with the boot disks... do you mean that because of too many drives plugged in your computer doesn't have power to spin them all up at boot? Maybe a beefier PSU is your answer then
Also, I'd stop juggling so many series and finish one before starting another if I were you. If I go that long between episodes I hardly remember what's going on with that show anymore haha. Fate/Zero deserves better than this!
That's somewhat of a rare case, unless it actually somehow does exceed the maximum power it can output (ex. You have a TDP of 432W and you have a 430W PSU).