wont turn on unless i unplug and plug back in

Compaq / Sr5333wm
September 26, 2009 at 18:18:22
Specs: Windows Vista, dulecore 2gigs ram
Processor Type: Athlon 64 X2 Dual-Core
Hard Drive Size: 360 GB
Operating System: Microsoft Windows Vista Home Premium

Type: AMD Athlon 64 X2 4200+ / 2.2 GHz
Multi-Core Technology: Dual-Core

Cache Memory
Type: L2 cache
Installed Size: 1 MB

Installed Size: 2 GB / 4 GB (max)
Technology: DDR2 SDRAM

Graphics Controller
Type: Integrated
Graphics Processor / Vendor: NVIDIA GeForce 6150 SE shared video memory (UMA)

Hard Drive: 1 x 360 GB - standard - Serial ATA-300 - 7200 rpm

problem is that it wont turn back on i have to unplug it to turn it on it will shut down ok but in order for me to turn the pc back on i have to unplug it wait 5 seconds and then plug it back in

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September 26, 2009 at 20:07:38
Sounds like a classic case of bad capacitors. Bad caps often cause intermittent problems like you have described. Think along the lines of bad rechargeable batteries(well not exactly but a similar situation).

I have seen situations where the problem lies with the caps on the mainboard and others where the problem is the power supply, I guess it may even be both in some cases.

Bad caps often bulge at the top and eventually leak electrolyte, if you open the case at look at the mainboard closely it's normally obvious if the caps on it are going bad, if no problems are found I would suspect the power supply.

I could be wrong on this but that's my experience with these sort of issues, if I'm right the problem will only get worse over time....

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September 26, 2009 at 20:19:24
they all look good on the main board so i change the power supply and still have the problem one thing i just noticed is the led light for goes green to red when it done shutting down

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September 26, 2009 at 22:24:50
I'm a little bit stumped then...

Just curious what is the wattage of the old vs new power supply?

What about the mains cable to the power supply, have you tried swapping that out? Sometimes(but rarely) the cables can be damaged.

As for the green to red led, I have seen this before, I don't believe it's actually red(unless it's not a standard setup - ie. dual colour led ) just a very small voltage going to the green led. I'm not sure if it's an indicator of a deeper issue or a "feature" of the mainboard.

Batch Variable how to

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