220-801 · Question #843
Which of the following occurs during POST?
The correct answer is C. RAM check. During POST (Power-On Self-Test), the BIOS performs hardware diagnostics including a RAM check to verify that memory modules are present and functional before the operating system loads.
Question
Which of the following occurs during POST?
Options
- AOS loads
- BSafe Mode starts
- CRAM check
- DMBR check
How the community answered
(25 responses)- B4% (1)
- C88% (22)
- D8% (2)
Why each option
During POST (Power-On Self-Test), the BIOS performs hardware diagnostics including a RAM check to verify that memory modules are present and functional before the operating system loads.
The operating system loads after POST completes and the BIOS hands control to the bootloader, not during the POST phase itself.
Safe Mode is a Windows OS boot option that is selected during the boot menu phase, which occurs after POST and bootloader execution.
POST is a firmware-level routine executed immediately at power-on that tests critical hardware components - including counting and testing RAM - before passing control to the bootloader. A RAM failure during POST typically produces beep codes or on-screen error messages indicating memory problems.
The MBR (Master Boot Record) is read after POST completes, as part of the BIOS boot sequence when it searches for a bootable device - it is not part of POST.
Concept tested: POST hardware diagnostics - RAM memory check
Source: https://learn.microsoft.com/en-us/troubleshoot/windows-server/performance/stop-error-occurs-during-startup
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