#hardware diagnostics

Toshiba and Fujitsu Laptop Beep Codes: Diagnostic & Repair Manual Introduction Diagnosing a hardware failure on a mobile platform requires a highly specific approach compared to modular desktop towers. When a Toshiba (Dynabook) or Fujitsu Lifebook laptop refuses to complete its Power-On Self-Test (POST) and outputs an audio loop, the embedded system controller is signaling a component lockout.…

What Does “Test PSU Without Tools” Mean The process to test PSU without tools refers to basic methods you can use to check if your power supply unit (PSU) is working, without using professional equipment like a multimeter or PSU tester. This is useful when: your PC does not start system restarts randomly you suspect PSU failure you want a quick diagnostic at home While not 100% accurate, these…

What Are PSU Failure Symptoms PSU failure symptoms refer to the warning signs that your power supply unit (PSU) is no longer delivering stable or sufficient power to your PC. The PSU is one of the most critical components. If it starts failing, it can cause: random restarts system instability failure to boot hardware damage in extreme cases Unlike other components, PSU problems are often…

What Does “No POST PC” Mean The No POST PC issue occurs when a computer powers on but fails to complete the Power-On Self-Test (POST) process. This means the system cannot initialize essential hardware components required to start the boot sequence. Typical symptoms include: no display on monitor no BIOS screen possible beep codes or complete silence fans spinning but system inactive A system…

What Does “RAM Not Detected” Mean The RAM not detected issue occurs when your system fails to recognize installed memory during startup or inside the operating system. This can result in: PC not booting black screen reduced usable RAM in Windows system instability In many cases, the motherboard cannot initialize memory during POST, which may also trigger beep codes or no display at all. This is…

When USB ports stop working, it can completely block the use of essential devices such as: keyboard mouse USB drives external HDD/SSD This issue can appear: suddenly after a Windows update after connecting a faulty device or due to hardware failure This guide explains exactly why USB ports are not working and how to fix the problem step-by-step. What Does “USB Ports Not Working” Mean If USB…

A PC that randomly shuts down without warning is one of the most serious and frustrating problems users encounter. Unlike restarts or crashes, a sudden shutdown means: system loses power instantly no warning or error message work or data may be lost This issue can happen: during gaming under load or even in idle This guide explains exactly why a PC randomly shuts down and how to diagnose and…

The power supply unit (PSU) is one of the most critical components in any PC. When it starts to fail, the system can show a wide range of unstable and confusing behaviors. Many users misdiagnose PSU issues as: GPU failure motherboard problems RAM instability In reality, a failing PSU can affect every component in the system. This guide explains all power supply failure symptoms, how to diagnose…