restart G3 calc.

Dear CCL'ers,
 I am trying to restart partially-completed G3 calculation from its
 checkpoint file.
 But the keyword ' restart '  doesn't work.
 Does anybody have an idea ?
 Thank you in advance.
 Stanislav Ivan
 Institut für Organische Chemie
 St. Johanns Ring 19
 4056 Basel
 Tel.: (+41) (61) 267 11 44
 E-mail: stanislav.ivan.,at,