" I go to the balance at the beginning, when we started the business, which is .00 in my bank ledger, but when I run a report it says I have $28,121.86 as a beginning balance.  This all started when I went to reconcile my April bank statement.  The beginning balance is off. "

These are different uses of the phrase "beginning balance."

For banking, we all start at 0. But we don't start at 0 again, unless we run out of money.

"I go to the balance at the beginning, when we started the business, which is .00 in my bank ledger, but when I run a report it says I have $28,121.86 as a beginning balance"

For reconciliation, the beginning balance is how you ended last time. This is the math of all previously cleared transactions.

"That is usually caused by a cleared transaction being changed or deleted. This may have happened but may have been more than one transaction.  I checked and could not find out how to run the reconciliation discrepancy report (in the bank rec screen) to find out what changed and put it back."

Changing the Status of a transaction, causing it to be no longer cleared, is a discrepancy but not an error. as long as everything has the same value, even if you changed or had to delete and recreate historic transactions, you ignore the beginning balance as reconciliations truly are to the known Ending Balance. You just checkmark anything that was cleared in the past, if it is showing as not cleared now, but you know it is has been processed.

For online Banking tool (your light gray, and a lightning bolt in PC), if you affect that Pending status, then you still can reconcile. You can always reconcile manually; you don't need that preliminary verification.

"Where do I go to ask a question or do I have to buy the service?"

You are in the right place, unless you want to pay for Support.

"The beginning balance is off.  This is definitely a QB problem.  But I don't know what to do about it.  Very frustrating.  Can anyone help me?"

Perhaps you just didn't understand that info that is being displayed to you.

A reconciliation process, whether manually, in QB Mac, QB PC, etc, really is only getting to the Same Ending balance, clearing or confirming that your data and the bank are the Same.