Need help with a 2001 Hyundai Sonata 2.5 liter.

timing belt broke.. had to have heads done up new valves all that good stuff. put it back together and now it won't start will turn over no spark threw plugs.
put a new crank sensor still nothing. all ideas helpful. check all fuses,grounds. all sensors plugged in. my brain is mush at this point. thank you. larry.
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Check some basic stuff:
Does the check engine lamp come on when you turn the key to the on position? If not, you need to investigate why the engine computer doesn't power up.
Check your fuses. One or more may be blown. This could be due to a pinched wire during disassembly or reassembly (i.e. may need to fix a wiring issue in addition to replacing fuse).
Are all the ground straps connected? If not, this could prevent proper operation of a number of components.
Are all the wiring connectors put back on the proper components? Be sure to check carefully any connectors which could be easily switched with another nearby.
Do you have 12V power to the coils and crank sensor when the key is in the on position? If not, you'll need to troubleshoot those circuits.
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