MISCHA Barton is hoping her new hair style will help her get her career back on track. The former OC star has gone blonde and is now telling pals her luscious locks will aide her sensational comeback from her troubles with drugs. Mischa is starting over and her new look is part of that, reveals a source close to the star. She is in talks over a number of acting projects including one major movie. Shes convinced being blonde is the key to changing her fortunes because not only does she feel more positive but shes found people to be more positive towards her. Following the cancellation of Mischas show The Beautiful Life, her friends spoke out about the stars fears over her career. She has been insecure about where her career was going and feels she may be a has-been at 23. She hasnt been overwhelmed with offers since The OC went off the air, a source said in October. She needs to feel shes still employable. Right now, thats her deepest fear. That no one will hire her again. Its not true, but thats how insecure she can get sometimes. SS