How to fix computer that auto on when plug-in

my pc automatic on but it's not booting but cpu fan is on

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Reply to: How to fix computer that auto on when plug-in
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Clarification Request
Take another shot at this.

I can't see if the issue is auto on or something else. Clarify that as well tell more about the PC such as make, model, age and what the issues are.

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os version : window 7 ultimate
mobo model : MCP6P M2+ Ver. 6.x
ddr : 2gb
cpu : amd sempron 2.3ghz
pc age : 2 years

issue is when i plug-in the pc automatically on but it's not boot but the fan of psu and cpu are on and i can't turn it of from power button ..

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So does the BIOS screen show?

You didn't clarify this enough.

Many BIOS have a setting to power on when power is applied. Turn that off.

As to the not booting, OSes can get damaged, hard drives fail so you have to think what it could be here. I don't see enough detail here to take a guess.

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BIOS screen not show

after i plug-in it will turn on automatically but it's not showing BIOS on monitor but the fan of cpu and psu is turn on

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There are many reasons for no bios screen.

Google this: THE DEAD PC.

You'll find the usual where we strip the PC down until it beeps in protest. Then we start building it up.

FIRST TEST. Unplug ALL USB and other connected things then try again.
Second test. Some machines do this when the CMOS BATTERY is low. You must accept that repair can other cost a little as we pop in a new battery. If paying for a few parts is unacceptable, take it to the repair counter. If guessing what to change next can't be accepted, it goes to the repair counter.

At this point it's just a DEAD PC. Strip it down till it beeps.

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no beep

i already try to remove the memory to try if their is a beep but nothing happend it's automatically on and the cpu and psu are on and already try to remove keyboard and mouse nothing happend

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Keep going.

On many desktops I can get a beep with good parts with just CPU+HSF, board, PSU and speaker. If those don't beep, one or more of those parts are bad.

To test the PSU I use the "GREEN WIRE TEST" and a Volt Meter. If you get a power up, you only need the Volt meter without the Green Wire jumper.

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