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Computer will start by itself - help

By vcummings ·
I'm working on an eMachines 633id (633 celeron)with an Ilssan power supply, model ISP120SI (I think this is only a 120 watt power supply????) This computer will be shutdown for days and suddenly, power on by itself for no apparent reason, and at noapparent time - sometimes with a couple of days in between and sometimes, I can't even get it to shutdown w/o immediately booting back up, and I have to pull the power cord to keep it shutdown. I pulled the case cover and blew out the inside of thecomputer as it was filthy - this seemed to solve the problem, so I decided that it had to be the dust conducting the electricity and somehow causing the computer to power on by itself. After 2 days of being plugged in and not powering itself on, I returned it to the owner and 5 days later, I was told it powered on by itself during the night 2x and then it powered on during the day and would not shutdown w/o rebooting itself immediately. I have been through the WinME operating system settings over and over again and all power settings (hibernation and sleep modes) have been disabled. I checked all settings in the bios also - disabled power management. I also have checked in software programs for a conflict of some kind (although I didn't feel this to be the problem) and have found no solution in this area either (I shutdown all startup items, all win.ini items, all vxd drivers and it still did this). I also used restore and set the computer back to 9/1/02 to no avail. I then dicided it had to be power supply or power switch related. This one is really throwing me for a loop and I would appreciate any help you may give me - suggestions, anything, please!!!!
I think it needs a power supply- the biggest I can find is a 200 watt, but I don't understand why the maker would only put a 120 watt in this computer in the first place;I must be missing something here.
Virginia

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Computer will start by itself - help

by opatzg In reply to Computer will start by i ...

Sound slike the power supply or it's switch to me, I'ld almost recommend a new case/power supply setup. That way they at least have some upgrade ability if they would so choose. I don't know why the emachine line is so underpowered, I own the 466iversion as well but it does function with 2 hd and dvd and cr-r/rw and still seems alright. 300 watt power supplies seem to be the minimum today for amd/p4 machines especially with additional cards and devices. You may wish to scan for viruses butif it is off I don't see how that would turn it on. Otherwise (cheapest solution) have them plug it into a power strip, shutdown and turn the power strip off. I have a newer keyboard on my newer pc and it has the power/wake/sleep on the keyboard and even with the bios turned off the keyboard still has control over wther there is power or not. Do they have a keyboard like this? If so try an old 104 key keyboard.
Good luck.

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Computer will start by itself - help

by vcummings In reply to Computer will start by i ...

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Computer will start by itself - help

by Alpha-Male In reply to Computer will start by i ...

Make sure there are no "wake on lan" or "wake on ring" settings. Also, if there is any fax or modem software, make certain it isn't set up to receive calls/wake the machine.

Other than that and the things you have already checked, I'd definitely look at the power supply and switch to the machine. Could be some kind of intermmitent short that is causing the problems.

It may be interesting to have it plugged into a UPS or power strip at a different outlet and see if that affects the issue in any way.

Good luck...hope this helps.

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Computer will start by itself - help

by vcummings In reply to Computer will start by i ...

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Computer will start by itself - help

by TheChas In reply to Computer will start by i ...

It might just be the motherboard.
I have seen this problem on 3 different systems, and tracked it down to a bad motherboard.
Remember, an ATX power supply always has a 5 volt standby circuit running.

Try booting from a DOS floppy, and shutting down using the power switch.

If the system does not shut down, or re-boots, then the circuit on the motherboard that tells the ATX power supply to turn on full is bad.

What I suspect has happened, is that the dust did indeed cause increased conduction.
It allowed a static charge from the user pressing the power switch to get to the motherboard, and damage the ATX switch circuit.

Chas

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Computer will start by itself - help

by vcummings In reply to Computer will start by i ...

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Computer will start by itself - help

by kariapp In reply to Computer will start by i ...

Sound slike the power supply or it's switch to me, I'ld almost recommend a new case/power supply setup. That way they at least have some upgrade ability if they would so choose. I don't know why the emachine line is so underpowered, I own the 466i version as well but it does function with 2 hd and dvd and cr-r/rw and still seems alright. 300 watt power supplies seem to be the minimum today for amd/p4 machines especially with additional cards and devices. You may wish to scan for viruses but if it is off I don't see how that would turn it on. Otherwise (cheapest solution) have them plug it into a power strip, shutdown and turn the power strip off. I have a newer keyboard on my newer pc and it has the power/wake/sleep on the keyboard and even with the bios turned off the keyboard still has control over wther there is power or not. Do they have a keyboard like this? If so try an old 104 key keyboard.
Good luck.

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Computer will start by itself - help

by vcummings In reply to Computer will start by i ...

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Computer will start by itself - help

by RCOM In reply to Computer will start by i ...

RAID ant and ROACH killer may be the fix for this problem, :) just kidding.

The way to test the front switch is to remove it's connector from the jumper on the mother board. If the PC still comes on then that will eleminate the switch as the problem.

Next would be the power supply. Check the wiring to make sure none of the wires are exposed from the insulation being torn away. Try another supply.

As mentioned, as long as the system is plugged in there's 5 volts present, on newer boards an indicator light is there to let you know there's still power to the board. Try another mother board. Micro ATX boards are cheap.

In answer to your quetion about the power supply. E-machines have everything soldered onboard, installed cards like modems, sound and video draw more current. So that's how they get away with using such small (cheap) power supplies.

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Computer will start by itself - help

by vcummings In reply to Computer will start by i ...

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