Member Avatar for arulprakash

Hello,
I am new user now,but i saw some solutions that makes me believe and trust on you that i can get 100% satisfaction solution from u.
About my Home PC problem is:
By the past 4 days ,Our PC is not booting when i press the CPU button,no light in CPU button,no fan sound inside CPU,nothing else.
When i kept this machine like this after 2 or 3 hours, when i comeback and see, our Home PC is booting up automatically and opening OS smoothly, there's no inbetween error or anything else, just running smoothly.
But if we shut down and switch ON the CPU after 30 minutes or 1 hour, the above same problem exists as we press the CPU button,it doesn't powers ON...but if we see after 3 hours , our PC is booting up normally without any error screen messages and opening my OS Vista Ultimate and also XP [dual OS]

what might be the problem happening like this always, any SMPS power problem or in motherboard or in memory RAM card, or in Backup UPS or ...what exactly the problem it is happening everytime for us.

Please HELP US that i mostly trust U

our Home PC configuration as below:
Intel MotherBoard DG35EC
Intel Core 2 QUAD Processor Q6600@2.40GHz
2GB DDR2 Kingston RAM
OS - Vista Ultimate 32-bit operating system[service pack 1]-First option
- XP Professional Service Pack 3
Monitor- 19inch LCD Viewsonic VX1940W
DVD writer[internal-serial-ATA]- Samsung SH-S223F
Video and Sound- Inbuilt motherboad
SMPS - 400W
UPS -APC Back-UPS ES 500

Our PC is going to be 1 year old by next month[december-26th]

My PC is assembled with branded components with help of my known computer engineer friend[very distant friend].
Also i want to mention about my motherboard that i saw a green light still glows in my motherboard without this CPU doesn't boot, also even when in working condition, my PC time also going slowly within this 1 year to complete my 1 st New Home PC system anniversay. How is it possible that my PC time changed slowly, always keep on changing every time .
My Latest situation is from sunday onwards , my PC didn't boot at al even when i press the CPU power switch button in the morning,then no boot up..
By the previous day i switched the CPU power switch ON in the morning, then in the evening at 5:30 only, my PC booted up and worked normally till my night sleep before go to bed. Then on next day[sunday], i cleaned my PC to remove some dust with soft brush, not by disconnecting all the power supply,just removed all the connection by the back of the components like monitor wire,mouse,keyboard,ethernet,speaker wire,..and also remove[unplugged] my 2 GB RAM memory card and put it back into same slot, didn't do disconnected Hard disk cable,DVD drive cable, and rest of the wire was connected to motherboard i didn't touched it at all.
Then my PC didn't totally booted up till i waited for the evening and also by night time.
Till so far i didn't touched my CPU because of nervous and if i touch it didn't go wrong by major problem of afraid.
Tell me so far i told my PC condition now, what might be the problem exactly, then what i supposed to do now...

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  • Latest Post Latest Post by aslan12

Dani AI

Generated

Observation (from 's report): a cold press of the power button gives no fans or POST, yet the system will power up on its own after a few hours. That pattern points to an intermittent hardware power/control fault rather than the operating system (so ’s “OS” diagnosis is very unlikely—an OS cannot prevent fans and LEDs from turning on).

Most plausible causes, briefly:

  • Failing PSU/SMPS or failing PSU control (PS_ON) — intermittent output or bad capacitors.
  • Motherboard power-control circuitry or caps failing (thermal recovery can explain delayed, spontaneous starts).
  • Bad front-panel power switch, short on the chassis, or a faulty UPS that won’t supply the startup surge.
  • Weak CMOS battery (CR2032) — explains the slow/wrong system clock but not the no‑power symptom by itself.

Recommended diagnostic order (safe → more invasive):

  1. Bypass the UPS: plug the PC directly to mains (UPS failures commonly cause strange start issues).
  2. Power‑drain: unplug mains, hold the power button ~10 seconds, reattach power and try again.
  3. Replace the CMOS battery (CR2032) with power removed — cheap and often fixes clock drift.
  4. Minimal boot: disconnect drives, USB devices, extra cards; leave CPU, one RAM stick and PSU. Try starting.
  5. Test the front‑panel header: short the two power pins briefly with a screwdriver (with PSU plugged in) to rule out a faulty case switch.
  6. If comfortable and safe, test the PSU separately (PS_ON green wire to ground) or measure rails with a meter. If unsure, have a shop bench‑test it.
  7. Inspect the board for bulging/leaking capacitors or burn marks; try a bench test outside the case to rule out shorts.

When the system next starts, back up important data immediately. Intermittent no‑start usually ends up being PSU or motherboard hardware — prioritize PSU checks and professional bench testing if the basic steps above don’t resolve it.

Member Avatar for arulprakash

please help me to resolve

Member Avatar for aslan12

your smps or os fault you change this two

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