Member Avatar for Sumit_4

Hello everyone,

I have this serious issue from a couple of days with my desktop.
I bought a new corsair vs350 PSU, since my older psu burst. Then it was working fine but just after two days it crashed and did not startup.

I checked each of the plugs and tighten them but nothing works. I can see the green light turning on while giving the power supply.
Amazing thing is that my cpu sometimes run successfully when I press the power button after few days. But that is all luck based. I don't understand what can be the problem.
It cannot be that my motherboard is busted since it do starts sometimes.

Can anyone help me in this issue.

Windows 7, core i5 processeor, 4GB DDR3 RAM, 9400GT NVIDIA graphics

Thanks and regards
Sumit

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  • Latest Post Latest Post by mike_2000_17

Dani AI

Generated

In this case reports the motherboard’s green LED comes on but the PC only powers up intermittently after a previous PSU failure. That green light usually only means the standby rail is present; it does not guarantee the main rails or the power-on sequence are working. Intermittent boots most often point to a failing PSU under load, a poor/loose power connection, or damaged motherboard components from the earlier PSU event.

  • Safety first: unplug AC and ground yourself before touching components.
  • Visual check: look for bulged/leaking capacitors, scorch marks, or residue around the CPU VRMs and 24‑pin/CPU power area.
  • Verify connectors: confirm the 24‑pin ATX and 4/8‑pin CPU power are fully seated and undamaged.
  • Minimal-boot test: remove GPU, drives and extra RAM; leave CPU, cooler and one RAM stick and try to POST. Add parts back one at a time.
  • Power-switch check: disconnect the case power switch and briefly short the two power pins on the front-panel header to rule out a bad switch or wiring.
  • PSU verification: swap in a known-good PSU or use a PSU tester. A motherboard LED can light from the 5VSB rail while the main rails fail under load, so a simple LED or paperclip test is inconclusive.

If the Corsair VS350 is new it can still be faulty; 350W may be marginal depending on drives and peripherals, so using a reliable 450–550W unit for testing is a sensible step. Back up important data before extensive testing. If intermittent behaviour continues after the minimal-boot and PSU swap, the motherboard (or components damaged by the earlier PSU) is the likely culprit and may need repair or replacement.

This advice combines ’s PSU-focused point, ’s capacitor check, and ’s wattage concern: isolate with a minimal build and a known-good PSU first to pinpoint whether the PSU or the motherboard is at fault.

Recommended Answers

All 3 Replies

Member Avatar for Patrick Thomas

I would try replacing the power supply. It may be working enough to light the green LED but not enough to power the mother board.

Member Avatar for SoftBa

Take a look at the motherboard and see if there are blown capacitors? Maybe old psu burn some motherboard electronics.

Member Avatar for mike_2000_17

A 350W PSU seems under-powered for the hardware that your computer packs. An i5 CPU, 4GB of RAM, and a 9400T graphics card would require quite a bit more power than that, at least a 500W PSU.

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