First, I'm confused about your dryer cord change. The green ground wire should NOT be connected to the neutral terminal block - but rather stay connected to the dryer cabinet. Here's a detailed link
the describes (with photos) how to change a dryer's 3 wire cord to a 4 wire cord. This work should be double-checked to make sure you've done it correctly and have a safe installation.
Since you're not getting the dryer to run (you didn't say if it spins but has no heat or if nothing works at all) and you've checked the components of the dryer; the only thing left is to make sure there is 240 volts at the dryer outlet.
Make sure the power is ON. You should have either a 2 pole 30 amp circuit breaker or two 30 amp fuses that provide power to this outlet. Make sure the fuses are good / circuit breaker is ON (not tripped).
Do not touch a metal probe at any time that one is connected to the outlet in the steps below.
With a meter set to 250 volts or higher range - or a wiggy tester, slip each of the probes into one of the two straight blade openings in the outlet (use of a test lamp is discouraged as there is not voltage reading provided - it should only be used to indicate the presence of power). You should have a 240 volt indication (an indication of anywhere between 220 and 250 volts is acceptable).
of the probes and press it into the ""L" shaped opening; leaving the other probe in the straight blade opening. A 120 volt indication should be present (an indication of anywhere between 110 and 125 volts is acceptable for this and the following 120 volt measurements).
Remove the probe from the "L" shaped opening and press into the "O" shaped opening. Again, 120 volts should be indicated.
With the probe kept in the "O" shaped opening, remove the other probe from the straight blade opening and insert into the other
straight blade opening. A 120 volt indication should be present.
Remove the probe from the "O" shaped opening and press into the "L" shaped opening. Again, a 120 volt indication should be present.
Remove the probe from the straight blade opening and press into the "O" opening. There should be a zero volt indication. A value of one or two volts is acceptable - but zero is expected.
If you get results that deviate in any way from those listed above, there is a problem with the circuit. An electrician should be called if the circuit breaker can't be reset or if fuses blow. If the voltages are indicating correctly but dryer still won't operate, there may be an issue with cord wiring or internal controls or safety devices inside the dryer.
I hope this helps. Please rate this reply - thanks!