Member Avatar for Member #808376

hey guys..
i have a Dual core althon 2.2ghz
abit motherboard
2gig ddr2 800
1tb
250gigs
160 gigs
graphics cards
1 DVD Writer
and ps 400w
2 fans

when i turn my pc it boots but when the log in screen of windows comes it shuts down by itself..
i have removed all the hardware put everything back the same problem
installed new Os but the same problem
run anti virus and reg cleaners the same problem.

cleaned all the dust of the cput fan the same problem..
i am starting to think that is my power supply do guys have any help for me?thanks

  • 5 Contributors
  • 7 Replies
  • 197 Views
  • 1 Week Discussion Span
  • Latest Post Latest Post by crunchie

Dani AI

Generated

This thread is a textbook example of motherboard voltage‑regulation failure. ultimately found bulging electrolytic capacitors and the board replacement cleared the shutdowns. Suggestions from (PSU) and (disk/repair checks) were sensible first steps; the behaviour — stable in BIOS but instant shutoff once Windows loads — strongly points at the board’s power components rather than an OS-only fault.

Why that pattern appears: BIOS keeps the CPU/GPU lightly loaded. When Windows starts, drivers, ACPI and full device power management create dynamic current spikes. Failed electrolytics (high ESR, lost capacitance or leaking) can’t smooth the VRM output under that load, so voltages collapse and the machine drops power. A weak or failing PSU can mimic this, so both should be checked.

Practical diagnostic checklist (safe, ordered):

  • Visually inspect the motherboard for bulged tops, split vents, brown crust or electrolyte residue around capacitors (look especially near CPU VRMs and the northbridge).
  • Test with minimal hardware (no discrete GPU, one stick RAM, no optical drives) — OP already tried this.
  • Swap in a known-good PSU or measure 12V/5V/3.3V rails under load with a meter.
  • Try Safe Mode / Last Known Good to see if reduced driver loading changes behavior.
  • Check Event Viewer for sudden power‑loss entries (e.g., Kernel‑Power 41).
  • If caps are clearly degraded, plan either re-capping or board replacement.

Repair notes: re-capping can be cost-effective if soldering skills exist — match capacitance, use equal-or-higher voltage ratings and low‑ESR, 105°C parts from reputable makers. Polarity and correct soldering matter; otherwise opt for a replacement board or professional service. After hardware repair, run filesystem checks and create a system repair disc (the software steps mentioned earlier are useful once the hardware is sound).

Preventive: use a quality PSU, keep VRM area cool with good airflow, and inspect older boards for swollen caps before failures get worse.

Recommended Answers

All 7 Replies

Member Avatar for Rik_

400watts seems rather low for a power hungry beast like that. Perhaps a more powerful power supply will get your system working properly.

Member Avatar for Member #808376

i have tried the whole systems with one hardrive without dvd-wr,graphics and two fans..it still kept on shutting down by itself...the shutdown only happens when i boot a operating systems...sometimes i boot successful using the option called last known good configuration(advanced). and installed a software to show the temperature of the cpu.the cpu temperature is about 32c to 36c and the systems is around 35c to 37c..when i turn on the computer and i go to bios..i can leave for a day on the computer doesnt go off as soon as i go to windows 7 it goes off.

Member Avatar for blokeste

I suggest getting into windows using `last known good con....` as you did before, then set chkdsk to check your hard drive on next reboot, also while your in windows 7, make yourself a`WIN 7 system REPAIR disc, simply type recdisc.exe in search and burn to cd. hope this helps..

Member Avatar for Member #808376

Guys thanks for all the but i found the problem.the Caps on the motherboard are faulty,they are have enlarged on top i so i got a new board and the computer works just fine..

Member Avatar for Rik_

You could have replaced the caps!

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.