Having problems with your Sony VAIO Digital Studio PCV-RX540 PC Desktop ?

Hp computer. hard drive light is solid yellow pc non working

\015 Hp computer. hard drive light is solid yellow then turns out. Monitor stays in standby. fans are working on mobo and psu. I can hear the hdd spin. Whats up?any help would be great. thanks\015

Answers :

What has transpired is the power supply is bad. Electrolytic Capacitors inside have failed. These capacitors relate directly to the voltage power rails of the power supply. They are filters.

Little more detailed.
Your computer power supply converts AC electricity into DC electricity. (A flashlight battery is an example of stored DC electricity)
AC comes into input Electrolytic capacitors. Goes to a rectifier bridge, and on through various other components. Along the way, this DC voltage is considered 'Raw'. It needs to be a steady, 'clean', supply of DC voltage. There are Electrolytic capacitors used in the final stage, to convert the 'raw' DC to 'true' DC.

In a computer power supply the Electrolytic capacitors are the weakest link. They are usually the first component to go out.

You computer power supply converts AC voltage into three DC voltages. 3.3 volts, 5 volts, and 12 volts. These are the power rails.

When one, or more Electrolytic capacitors are weak, they make a weak voltage rail.
To simplify explaining the construction of an Electrolytic capacitor, let's just state they are small aluminum 'cans', and have a seal at one end, or both ends. Inside there is an Electrolytic paste.
This paste can break down, and when it does it forms a gas. (Hydrogen gas) This gas expands inside the 'can', pushes up on the seal/s, and makes Electrolytic paste ooze out.

So much paste loss, and the capacitor can operate in a weakened state. Too much paste loss, and the capacitor fails.

ALL the lights in your computer use less than 1 Watt. EACH fan uses 2 to 3 Watts. A harddrive just sitting there spinning, may use up to 5 Watts.

A processor uses 55 to 125 Watts! Depends on the make and model.
Since the power supply is to weak to provide enough power to turn the processor on, the harddrive isn't activated. It just sits there and spins. No Boot record on the harddrive is found, so no Operating System is going to be running. (WinXP is an example of an O/S)

This essentially means No computer! Harddrive activity light indicates yellow, then goes out. There is no harddrive activity.

No signal from the computer, because the computer isn't working.
Monitor stays in Standby, because there is no signal from the computer.
Power supply failure is 70% of computer issues.

Why?
Owner neglects to keep the inside of the computer, and the power supply clean. Doesn't use a can of compressed air for computers regularly.
Also there is another issue that the owner has nothing to do with.
Capacitor Plague.
http://en.wikipedia.org/wiki/Capacitor_plague

Solution? Replace the power supply.

I know the above info may seem like a 'Hard pill to swallow', but as stated. A weak power supply will still spin fans, and light lights.
Harddrive may spin, or spin up, then stop.

The processor isn't getting enough power.
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