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Fix a desktop that will not POST

We'll rule out RAM, GPU, and power, then isolate the cause—loose RAM, failed GPU, or motherboard—or tell you when to call a pro.

Troubleshooting · Home maintenance
15–30 min
What you'll need
  • Phillips screwdriver (to open case)
  • Compressed air (optional, for dust)
Step 1 of 6

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Steps

Goal: Rule out RAM and GPU, then isolate the cause.

Reseat RAM

Goal: Rule out loose or faulty RAM (most common POST failure).

  • Power off and unplug. Open the case. Remove each RAM stick, blow out slots, reinstall firmly until clips click.
  • Try one stick at a time in the first slot. If one stick POSTs and another does not, the failing stick is bad.
  • Good: Desktop POSTs. If not, proceed to Reseat GPU.
  • Bad: No stick works—check GPU, then clear CMOS.

Reseat GPU

Goal: Rule out loose or failed discrete GPU.

  • Power off and unplug. Remove the discrete GPU, blow out the slot, reinstall firmly. Reconnect power cables.
  • If the CPU has integrated graphics, try the motherboard video port without the discrete GPU.
  • Good: Desktop POSTs with integrated or reseated GPU. If not, clear CMOS.
  • Bad: Still no POST—call a technician.

When to get help

Call a technician if:

  • Reseating RAM and GPU does not help.
  • You hear beep codes you cannot interpret.
  • The PSU makes clicking or buzzing.

Verification

  • The desktop reaches the BIOS screen or boot logo.
  • No immediate shutdown or endless restart loop.
  • Fans and LEDs run steadily.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Power and symptom Confirm power on; distinguish from no-power and no-signal.
  2. RAM Reseat RAM; try one stick at a time.
  3. GPU Reseat discrete GPU; try integrated graphics.
  4. CMOS and peripherals Clear CMOS; disconnect peripherals.
  5. Call a pro RAM and GPU ruled out; beep codes; PSU noise.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Desktop model and motherboard:
  • RAM configuration (sticks, slots):
  • Whether reseating RAM or GPU changed behavior:
  • Beep codes (if any):
  • Steps already tried:

Does the desktop power on (fans spin, LEDs light)?

If no power at all, see fix-desktop-will-not-turn-on. If power but no display, this guide applies.

Check fans and LEDs. Power on: desktop is failing POST—proceed to RAM. No power: see fix-desktop-will-not-turn-on.

Yes No

You can change your answer later.

See fix-desktop-will-not-turn-on

No power—check power cord, outlet, and power supply. See Fix a desktop that will not turn on.

Done

Have you reseated the RAM?

Loose RAM is the most common POST failure.

Power off, unplug. Remove and reinstall each RAM stick firmly. Try one stick at a time. Good: POST succeeds—RAM was loose. Bad: still no POST—check GPU.

Yes No

You can change your answer later.

Reseat RAM and retry

Open the case. Remove each RAM stick, blow out slots, reinstall firmly. Try one stick in the first slot. If still no POST, reseat the GPU and clear CMOS.

Done

Do you have a discrete GPU?

A loose GPU often causes no display.

If yes, reseat the GPU and reconnect power. Try integrated graphics if available. If no discrete GPU, clear CMOS and disconnect peripherals.
Question

GPU reseated or ruled out?

Continue

You can change your answer later.

Clear CMOS and retry

Power off, unplug. Clear CMOS (jumper or remove battery 30 sec). Disconnect all peripherals. Power on. If still no POST, call a technician.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a desktop not POST?
Loose or faulty RAM, failed GPU, insufficient PSU, CPU overheating, or motherboard failure. RAM is the most common cause—reseat and test sticks one at a time.
Can I fix a desktop that will not POST myself?
Yes. Reseat RAM and GPU. Try one RAM stick at a time. Clear CMOS. If the desktop still fails POST after ruling out RAM and GPU, a technician may be needed.
When should I call a technician for a desktop that will not POST?
If reseating RAM and GPU does not help, or you see beep codes you cannot interpret, or the PSU makes clicking or buzzing. Motherboard or component replacement may require a professional.

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