Did you remove the ovp relay with the fuse or fuses on the top .Give it a shake .If it rattles its shot . But some can be resolderd inside . My car was 3 years old .It keept stoping and not stsrting .The garage said to the owner [before me ] they would fix it .The garage removed the head .Replaced it after a refurb , with new gaskets . Well she still started and stoped . Then they changed the ovp relay .It fixed it for good after £1000 bill for head refurb that did not need it .