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A.6. Using the Maintenance Boot Modes

A.6.1. Loading the Memory (RAM) Testing Mode

Faults in memory modules may cause your system to freeze or crash unpredictably. In some cases, memory faults may only cause errors with particular combinations of software. For this reason, you should test the memory of a computer before you install Fedora for the first time, even if it has previously run other operating systems.
Fedora includes the Memtest86 memory testing application. To boot your computer in memory testing mode, choose Memory test at the boot menu. The first test starts immediately. By default, Memtest86 carries out a total of ten tests.
To halt the tests and reboot your computer, enter Esc at any time.