To begin, it is vital to remember that if you have repeatedly clicked on the QuickBooks icon, QuickBooks won’t open (double-clicking repeatedly also causes this). It's best to wait a few minutes before restarting QuickBooks. To make numerous requests, avoid clicking multiple times.
Reasons for QuickBooks's failure to respond:
A faulty hard disc
The company's name is too long or complex.
QuickBooks Desktop is not properly installed due to an outdated operating system.
The QBWUSER.INI file is corrupt.
Keyword: QuickBooks error 12029