Computer boot blue screen prompt stop: c000021a fatal system error solution

Recently, a customer's computer encountered a blue screen error with the message: "STOP: c000021a {Fatal System Error}". The system displayed the error: "The session Manager Initialization system process terminated unexpectedly with a status of 0xc000003a (0x00000000 0x00000000). The system has been shut down." This kind of issue can be confusing for users without technical knowledge. In this article, we'll walk you through some possible solutions to fix this problem and get your system running again.

Computer boot blue screen prompt stop: c000021a fatal system error solution

Solution for Stop: c000021a Fatal System Error:

Method 1: Since this blue screen appears before the Windows desktop loads, try pressing the F8 key during startup. This will bring up the Advanced Boot Options menu. From there, select "Last Known Good Configuration" or try booting into Safe Mode. If you can successfully enter the system, check for recently installed software or updates that might be causing the issue. Uninstall or roll back any recent changes to see if that resolves the problem.

Method 2: If Method 1 doesn't work, the next step is to consider reinstalling the operating system. In most cases, a fresh installation can resolve the issue. While hardware problems can sometimes cause this error, I haven’t personally encountered such cases related to this specific blue screen. However, it's always good to rule out hardware issues like faulty RAM or a failing hard drive using diagnostic tools.

If you're facing this error and suspect it's due to hardware, feel free to share your situation—we’re here to help! Whether you're a tech-savvy user or just starting out, understanding how to troubleshoot these kinds of errors can save time and frustration. Stay informed and keep your system running smoothly!

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40V DC Power Supply

APM 40v DC Power Supply is usually used in testing cable or circuit breaker filed. To protect user`s device and the laboratory power supply itself, protection functions of OVP,OCP,OPP etc. could be started according to the requirement.SCP function defaults to ON.

48vdc power supply provides built-in standard automobile electrical testing curves,users can select any built-in curve to do the DUT performance test directly according to their demand.

Some features of the power supply as below:


  • Ultrafast respond time and high efficiency
  • Accurate voltage and current measurement capability
  • Constant Power and wide range of voltage and current output
  • Equips with LIST waveform editing function
  • Master/Slave parallel and series operation mode for up to 10 units
  • Voltage drop compensation by remote sense line.
  • Compliant with SCPI communication protocol
  • Support RS232/RS485/LAN/USB (standard) ,GPIB (optional)
  • Have obtained CE,UL,CSA,FCC.ROHS


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