Bed removal no start

[WDCDAVE]

I just bought a 05 dually with 217000 km at a Richie sale.The truck had a alum. welding deck on it proir and they put the origianal back on and now its a no start.The FICM shows 48v on crank,lots of fuel at filter and fills fast,oil pres. goes up on dash after crank,unhooked icp,going to check volts there yet.Just wondering if removing the bed if theres a ground there somewhere in that process they might have missed.I disconnected the command start on it.It has one key that looks like it was cut as it has no black plastic on it,but sure they are not chipped in this year.Think it might be HPOP but was there when they brought it in and am going on the info he told me as cannot find any other except the old work history on it and nothing there just regular maintance,was with truck.Any comments would help as going down the list of issues for no-start on site here Thanks