This guide covers the most common causes of boot problems, crashes, no‑display issues, and general instability. Work through the steps in order — most problems are solved long before you reach the end.
CPU Troubleshooting
1. Update the BIOS
If the system won’t boot, restarts repeatedly, or shows no display, an outdated BIOS is one of the most common causes.
Check your motherboard manufacturer’s website for the latest version.
2. Clear the CMOS
Resetting the CMOS removes old settings that can conflict with a new processor.
Use the motherboard jumper or remove the battery for a few minutes.
3. Reseat or test RAM
RAM problems often look like CPU problems. Try:
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Testing one stick at a time
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Swapping slots
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Making sure each module is fully seated
4. Check CPU power cables
Make sure the 8‑pin (or 4+4‑pin) EPS connector is firmly connected.
If this cable isn’t fully inserted, the system won’t start.
5. Reboot a few times
Some boards need several training cycles to recognise a new CPU, especially after a BIOS update or CMOS reset.
GPU Troubleshooting
1. Install fresh GPU drivers
Use the official NVIDIA or AMD installer and choose the clean‑install option to remove old driver conflicts.
2. Reseat the GPU
A slightly misaligned PCIe connection can cause:
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No display
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Random crashes
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“GPU not detected” messages
Remove the card and reinstall it firmly until the latch clicks.
3. Check PCIe power cables
Make sure all connectors are fully inserted.
For higher‑power cards, use separate PCIe cables, not daisy‑chained ones.
4. Update the BIOS and check PCIe mode
Ensure the motherboard is running the slot at x16 and is on the latest firmware.
5. Try different display cables or ports
Faulty HDMI or DisplayPort cables are extremely common and can mimic GPU failure.
6. Check airflow and GPU sag
Poor cooling or a sagging card can cause intermittent contact or thermal throttling.
7. Verify PSU wattage
Make sure your power supply meets the recommended wattage for your GPU and has the correct connectors.
How to Tell if It’s a Hardware Fault
After troubleshooting, genuine hardware issues usually show:
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Consistent crashes under load
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Visual artifacts (lines, flickering, corrupted textures)
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Failing stress tests or benchmarks
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No POST even with known‑good components
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Burning smell or visible damage
If you’ve ruled out BIOS, drivers, RAM, PSU, cables, and cooling, the component may need replacing.
Preventing Future Problems
A few simple habits help avoid repeat issues:
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Keep BIOS and drivers updated
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Use a reliable power supply
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Avoid forcing connectors
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Clean dust regularly
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Maintain good airflow
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Use surge protection
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