The German-born actor moved to Hollywood from Manchester, England, after finding he had little in common with his friends following his two-year experience filming the Rings movies in New Zealand.
But, Monaghan tells Rolling Stone magazine he then spent the best part of a year spiraling into depression and loneliness.
He recalls, "I didn't have a car, I didn't have a phone... I wasn't going out, I wasn't trying to get back on track. I was just spending a year doing nothing.
"It was unhealthy and melancholy for no real reason--and it was cumulative because I got p**sed off that I was depressed."
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