What does No POST / No Display mean?
Computer powers on (fans spin, LEDs light) but no image appears on monitor and no beep codes.
Common causes
- RAM not seated properly
- GPU not seated in PCIe slot
- CPU power connector not connected
- Bad/incompatible RAM module
- Failed GPU
- CPU not seated (bent pins on socket)
- Insufficient PSU wattage
Diagnostic & testing steps
- 1. Check all power connections: 24-pin ATX, 8-pin CPU, PCIe power to GPU
- 2. Reseat RAM - try one stick at a time
- 3. Reseat GPU in PCIe slot
- 4. Listen for beep codes and look up beep pattern for BIOS brand
- 5. Try onboard video if CPU has integrated graphics (remove GPU)
- 6. Check DRAM debug LED on motherboard if equipped
- 7. Clear CMOS by removing battery 30 seconds
Tools required
- Screwdriver
- Multimeter
- POST card
OEM parts & part numbers
RAM Module, CMOS Battery
Safety warning
⚠️ ESD HAZARD: Always ground yourself. Never swap components while system is powered on.
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