Try add keywords
# guess=read geom=checkpoint
but you have to remove all cartesians or z-matrix from file before run.
W.
ParthaFriends, I tried to complete a OPT=QST3 calculation but it failed for break in power supply.How can I use the restart option?%rwf=myrwf2b3lypmolecule specification
%chk=2b3lypTrans State 15 anthra.chk
%mem=1500mb
#b3lyp/6-31g(d) opt=(qst3 calcfc)
0 1
.....
--Link1--
%rwf=myrwf2b3lyp
%chk=2b3lypTrans State 15 anthra.chk
%nosave
%mem=1500mb
#restart
#b3lyp/6-31g(d) opt=(qst3 calcfc)
0 1
--Dr. Partha Sarathi Sengupta
Associate Professor
Vivekananda Mahavidyalaya, Burdwan