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PC Randomly Shuts Down
Quick answer: If your PC randomly shuts down during normal use, possible causes include overheating, power supply problems, loose components, faulty RAM, or a motherboard issue. In this customer's case, systematic testing eventually confirmed that the motherboard was the cause. Replacing it resolved the issue. The total service cost was SGD $160, and the replacement motherboard was supplied by the customer.
Last updated: May 2026
Job Summary
Service
PC motherboard replacement and diagnostics in Singapore
Customer's Problem
PC kept randomly shutting down and restarting during normal use
What We Did
Diagnosed faulty motherboard through systematic testing, replaced with customer's replacement unit
Result
PC runs stable, tested with stress test, no more random shutdowns
Watch the Repair
Why Does a PC Randomly Shut Down?
A PC that randomly shuts down during normal use can be caused by several hardware issues, including power instability, loose components, overheating, faulty RAM, a faulty graphics card, or a failing motherboard. In this case, the PC would shut down and restart unpredictably, so we tested the system step by step instead of replacing parts blindly.
The customer brought the PC into our store for diagnosis. Further testing eventually isolated the motherboard as the cause of the shutdown issue.
Root Cause
After testing the power supply, reseating the RAM and graphics card, replacing the motherboard, and running another stress test, the motherboard was confirmed as the issue. Once the replacement motherboard was installed and tested again with the customer’s own power supply, the PC no longer shut down automatically.
What We Checked First
- Initial testing based on the customer’s description of the issue
- Power supply behavior when starting the PC
- Fan behavior after boot
- RAM seating
- Graphics card seating
- System stability under stress test
How We Fixed It
- Initial testing: We started by testing the PC based on the customer’s description of the random shutdown and restart issue.
- Power supply and fan check: The power supply was tested first. After starting the PC, three fans did not spin, so we continued checking the system.
- Stress test: We pushed the PC under load to check stability and reproduce the shutdown issue.
- Reseated RAM and GPU: We reseated the RAM and graphics card to rule out loose connections, but the system still shut down.
- Motherboard replacement: We replaced the motherboard, confirmed the PC could turn on properly, then ran another stress test.
- Final confirmation: We tested again with the customer’s own power supply. The PC no longer shut down automatically, confirming the motherboard was the issue.
Photo Guide
Swipe or use arrows to see the repair process.
Power and Component Check
The power supply was tested first. After starting the PC, three fans failed to spin, so we continued checking key components.
RAM and GPU Reseating
The RAM and graphics card were reseated to rule out loose connections, but the system still continued to shut down.
Motherboard Swap
The graphics card was removed so we could access the motherboard safely.
Final Stability Test
After replacing the motherboard, the PC turned on properly again. We then tested it with the customer’s own power supply and ran another stress test to confirm the shutdown issue was fully resolved.
"When a PC randomly shuts down, we test the components step by step to identify the cause before replacing parts. In this case, testing confirmed that the motherboard was the issue."
Mansa ComputersFinal Result
The PC now runs stable with the replacement motherboard installed. After testing it again with the customer’s own power supply and running another stress test, the system no longer shut down automatically.
The fault was confirmed to be the motherboard, and the shutdown issue was resolved.
Cost Breakdown
| Service | Cost (SGD) |
|---|---|
| Pick up and delivery | $40 |
| Rebuild and installation | $120 |
| Total | $160 |
The total service cost for this job was SGD $160. The replacement motherboard was supplied by the customer. Press the WhatsApp button on the right to speak with us about your PC issue.
Frequently Asked Questions
How much does PC repair cost in Singapore?
For this particular job, the total service cost was SGD $160: $40 for pickup and delivery and $120 for rebuilding and installation. The replacement motherboard was supplied by the customer.
Why won't my PC stop restarting?
Possible causes include overheating, a failing power supply, faulty RAM, loose components, or a motherboard issue. Systematic testing helps narrow down the cause. In this case, the motherboard was confirmed as the source of the shutdown and restart problem.
How do I know if my motherboard is failing?
A failing motherboard can cause symptoms such as random shutdowns, unexpected restarts, no display, or inconsistent device behaviour. These symptoms can overlap with other hardware faults, so confirmation usually requires systematic testing before replacing the board.
PC Shutting Down Randomly?
Tell us the symptoms and we'll help you figure out the next step. No obligations, just a straight answer.
Press the WhatsApp button on the right to speak with us about your PC issue.
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