2004 Volvo Xc90 Timing Belt Replaced New One Well Tensioner Idler This Done

Timing belt replaced with new one as well as tensioner and idler. This was done with the Volvo instructions I recieved with the dayco timing belt kit as well as many reading posting from other individuals who have done the same job.Now the car wont start even though all the marks are lined up per the instructions. Any pointers would be great.