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Changed my PSU and computer worked fine. Then I shut it down and it showed a Boot error. I opened it up (the case) and now the monitor show no signal and the cdrom drive has no power, but the computer starts up??

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After the PSU swap reported by , the next steps should prioritize verifying power delivery and simple hardware isolation. 's request for system specs is on point: knowing the PSU model/wattage, motherboard model, GPU, and how the monitor is connected (onboard vs. discrete) speeds diagnosis.

Start with a short, ordered checklist:

  1. Power connectors: confirm the 24‑pin ATX and the 4/8‑pin CPU (EPS) connectors are fully seated. If a discrete GPU is installed, confirm any 6/8‑pin PCIe connectors are plugged into the GPU and not left out.
  2. Modular cables: use only the cables supplied with that PSU. Cables from different PSU brands/models can be non‑compatible even if the plugs fit.
  3. Peripherals: check the SATA/Molex power to the optical drive; a dark drive with fans/LEDs running points to missing peripheral power or a faulty rail.
  4. Minimal boot: remove non‑essentials (extra drives, USB devices), boot with one RAM stick and onboard video (or remove GPU if the board has onboard output) to see if POST progresses.
  5. POST indicators: listen for motherboard beep codes or watch POST/CPU/mem LEDs and the debug display (if present). Note any blink/beep patterns.

If the system still shows no video but fans run, test the PSU with a known‑good unit or a PSU tester/multimeter to confirm voltages. Also check for shorts (standoffs, misplaced screws) and reset CMOS by removing the coin cell for a minute. For faster help, report the PSU make/model and wattage, motherboard model, GPU model, which connectors are used, and any beep codes or motherboard LED indicators seen during power‑on.

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Member Avatar for caperjack

Changed my PSU

did you change it with a new psu. just a used one ,that may have not been any better than the one replaced

Member Avatar for jdcampb2

did you change it with a new psu. just a used one ,that may have not been any better than the one replaced

The PSU was new.

Member Avatar for caperjack

how about some specs on the computer, and the power supply !
like wattage of psu.
cpu size/ram ,hard drive size and OS installed ,ect ect

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