Identify the entry which's date & time is intersecting another entries date & time

Dear Experts,

We enter some production data - Production qty., Production Start Date & Time, Production Finish Date & Time etc.

Say there are four entries of a single machine -

Order	start	start time	Finish	Finish Time
1	01/12/2012	07:00:00 AM	01/12/2012	12:30:00 PM
2	01/12/2012	12:30:00 PM	01/12/2012	05:30:00 PM
3	01/12/2012	01:30:00 PM	01/12/2012	06:00:00 PM
4	01/12/2012	05:30:00 PM	01/12/2012	07:00:00 PM

We can see that the 3'rd entery is wrong, as the machine was busy from 12:30 to 5:30 for order no. 2 & then from 5:30 to 7:00 for order no. 4.
Hence the (entry of ) order 3 can not be processed in-between.
Such errors happens due to wrong data entry as the data entry team has to do hundreds of entries in a day.

Our query is how we can identify such entries. We have tried some logic (attached excel file) but failed to find complete solution.
Please suggest if there is any way out.

Dear Moo,
Thanks for looking into for my first post in Excel Forum, the solution given by you works fine for the given data.

But if the data is unsorted, i.e. the start & fin dates are not in Ascending /descending manner then this will not work.
Even there will chances where the data of two different machines will be in data table (sorry I missed to mentioned in my earlier post).

So I want some thing like COUNTIFS or the formula which could handle the range data.

Please help, thanks in advance...

Check.xlsx