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Operating system not found

I just replaced my power supply and when i go to turn on the computer, it gives this prompt. I did nothing else but the power supply - any ideas of what i can do? thanks in advance

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Re: operating system not found

It is possible that you loosened the cables that connect to the harddrive,try opening the case and checking all your connections again also check where the harddrive cables plug into the motherboard.rate me if this works or leave more info.

Posted on Nov 18, 2007

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Turns on but nothing happens, no signal to monitor, mouse or keyboard. Fan is on.

Bad Power Supply.
Weak voltage power rail.

Enough power to light LED lights, and spin fans, but Not enough power to turn the Processor on.

1) ALL of the LED lights on at one time, use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts.

3) A typical Processor can use 51 to 125 Watts.
Just depends on what Processor it is.

No Processor operating, No computer.
No computer operating, No signal on the monitor.
NO video signal to the monitor from the computer)

Need guidance in replacing your Power Supply, please state in a Comment.
Need guidance in choosing a correct Power Supply, I would be happy to give a few references for you to look at.


(Do you have a KNOWN to be good, Compatible power supply around that you can use for a test?
Perhaps in some computer tucked away in the closet, etc.
Maybe a relative or friend has upgraded to a better computer, and has an unused one you could borrow the Power Supply from)

Dec 02, 2010 | Acer PC Desktops

1 Answer

I have an emachine et1161 i hit the start button and the prosser fan starts but nothing else if i hold the start button then the cd rom starts and i can feel the hard drive start but nothing will come on...

Suggest you change out the Power Supply, with a KNOWN to be good, and compatible Power Supply.

Must have the correct power cables, and the correct amount of them.
1) 20-pin ATX main power cable;

2) 4-pin ATX +12 Volt power cable; (Power for the Processor)

3) SATA power cable; (Harddrive)

4) Standard 4-pin Peripheral power cables for the optical drive/s, and any fans;

5) Floppy Drive power cable. Not used for a Floppy Drive in this case, but power for the Card Reader; ]

Must have the correct Form Factor.
The Form Factor of the Power Supply for the ET1161 is ATX.
Size of the Power Supply case is approximately 3-1/2 inches Tall, 6 inches Wide, and 6 inches Long.

Should have 250 to 300 Watts.

Why am I stating this? Because you, or someone you know, may have an unused computer sitting around that you can borrow the Power Supply for a test. (GOOD and Compatible)

From your statements, and my diagnosis, I believe you have a bad Power Supply.
Weak voltage power rail.

Enough power to turn on LED lights, and spin fans, but not enough to turn the Processor on.
1) ALL of the LED lights combined use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts of power.
3) A typical Processor can use 51 to 125 Watts of power.
Depends on what Processor it is.

I also base it on that eMachines uses low quality generic Power Supply's.
Bestec, or Delta, or another generic Power Supply manufacturer.

I also base it on that Power Supply failure is one of the leading causes of computer failure.

(If the inside of the computer, and the inside of the Power Supply, are not cleaned out on a regular basis as needed, this is also another contributing factor.

Use a can of compressed air for computers. Power unplugged to computer, and observe Anti-Static Precautions.
{Use the plastic straw in the ventilation holes of the Power Supply)

Feel the harddrive start? Yes. You feel the Platters inside the harddrive being spun by the spindle motor.

No Processor operating, there is nothing to find the boot record on the harddrive. The platters spin, but the Read/Write heads are not brought into play by the Actuator motor

[BIOS = Basic Input/Output System.
A small program that when the computer is first turned on, looks to see what devices are installed, does a Ram Memory count, then TURNS the Processor on, and hands the computer over to the Operating System.

An optical drive, (CD/DVD drive) will operate even if the Operating System doesn't. It's a mechanical device that uses 12 Volts.
(One example of an Operating System is Windows XP ]

How harddrives work;

Sep 25, 2010 | E-Machines PC Desktops

1 Answer

My computer wont boot up the power light comes on,the speakers come on but the keyboard doesnt come on and nothing to the monitor...oh by the way its an emachines w3506

If the keyboard doesn't briefly light up the Caps Lock, and Numlock keys, when first starting the computer, and there's no video signal to the monitor, (No Signal), the computer isn't working.

Suspect the Power Supply first.

Bad Power Supply, is one of the most leading causes of computer failure.

This is brought about usually by one of two things, or a combination of both.

1) eMachines are Budget line of computers. Cheap quality parts are used, to defray the cost of making the computer.
One of the cheap hardware components is the Power Supply.

2) Computer is dirty inside, as well as the Power Supply.
The hardware components inside a computer, as well as the Power Supply, are cooled by air from fans.

Dirt, dust, etc, cause the cooling capacity of the cooling system, to drop tremendously.
Heat = Wasted Energy.

The Power Supply tries to keep up with the call for power, cannot, and components inside the Power Supply fail.

The Power Supply has a weak voltage power rail.
It may seem that the computer is receiving power, but it isn't receiving enough.

A) ALL the lights use less than 1 Watt of power

B) EACH fan uses 2 to 3 Watts of power

C) A typical Processor uses anywhere from 51 watts to 125 Watts.
Depends on what Processor it is.

The W3506 comes with an Intel Celeron D 352
(Single core processor, that operates at a maximum frequency rate of 3.20GigaHertz. 3.2GHz)

eMachines Support>Specifications>W3506,

Information on the Intel Celeron D 352 processor,

The Intel Celeron D 352 can use up to 86 Watts, when operating at maximum capability.

This is why it may seem as though the computer is working, but in actuality it isn't.
The Processor isn't running.

No Processor operating, no computer.
No computer, No Signal to the monitor.
No Processor running, there is nothing to make the Operating System work. (Windows XP is one example of an O/S)

No Operating System working, the keyboard isn't going to 'light up'.

From here the diagnoses should be to test the Power Supply, or replace it with a KNOWN to be good, compatible power supply for a test.

[Compatible being the Power Supply has enough Wattage, the correct power cables, and enough of the correct power cables]

The Power Supply can be tested in the computer, with all the power cables disconnected.
Use a multimeter, or a power supply tester.

Example of an economical Power Supply Tester,

This gives information on the various power cables used, in a personal computer,

Using the multimeter, the Positive (Red) probe is connected to the power wire to be tested, then the Negative (Black) probe is touched to a Ground wire.

There are three main voltages, given out by a personal computer power supply, (All are DC volts),

1) The 3.3 Volt power rail.
Wires that have Orange insulation are 3.3 Volt wires

2) 5 Volt power rail. Red insulated wires
3) 12 Volt power rail. Yellow insulated wires

For 12 Volt power, 11 to 13 Volts is okay. Below 11 Volts it's time for a new power supply.

4) ANY Black wire is a Ground wire.

Questions? Post in a Comment.

May 19, 2010 | E-Machines eMachines Desktop PC

1 Answer

Compaq Presario S3040SE PC Desktop was working fine. when i turned it on next day screen says operating system not found. restart. now monitor wont kick on and hard drive light doesnt come on. only power...

Normaly when you get the error that the operating system cant be found, it is a indication that the hardrive has either gone bad, or somehow some of the system files got deleted. I would say though since the hard drive light wont come on it could be the hardrive has shut down completely. But you still should see the company image of your computer when you start it up, (the bios screen)

A bad hardrive would be my first guess, 2nd problem if its not your harddrive would be a new power supply.

Dec 31, 2009 | HP Compaq Presario S3040SE (DF222AR#ABA)...

1 Answer

Replaced power supply, now it wont boot

The windows file system has nothing to do with the new power supply. Possibly yes however that the windows registry was damaged before you replaced the power supply due to an abrupt switching off operation which may have damaged the boot sector within your HDD. The solution is as recommended by windows. You can use the windows setup CD to get this fixed. I suggest you run a chkdsk /r at some point during the repair when you get the command prompt C>. Check the following for further info.

Aug 05, 2009 | Sony VAIO VGC-JS230J/B PC Desktop

2 Answers

My computer won't come on.

Lilyoungun8, you need to be a little more specific; Check these:

1. Is the power from the mains turned on?
2. Turn it off from the wall socket and push the power cable back in, it may be loose. Then try turning it on again.
3. Hopefully it is none of the below, but if none of the aboe 2 things work, it may be one of these in increasing order of importance:
3.a. Your power cable is faulty - you will need to replace it
3.b. Your PC power supply is shot - you will need to replace it
3.c. Your motherboard has died - you will either need to replace it or buy a new PC altogether.

Do let us know...

- Quirino

May 22, 2009 | eMachines T6420 PC Desktop

2 Answers

No output on Monitor

Hello, It depends on how you cleaned the computer. If you removed the card from the slot then it may not be reseated back into proper alignment. If it is onboard video then there may still be a bit of dirt across one of the chip contacts. The other option would be when you plugged the monitor cable back in, you may have accidently bent a pin on the plug. Make sure that all power to the computer is off for several minutes before disconecting the cable and then look at the cable end to see if one of the pins got bent. Carefully straighten it with fine needle nose pliers then carefully plug it back in. If this doesn't work then you may have created static electricity and blew out the video system. Hope this helps, RAC

Apr 13, 2009 | AMD (90613) PC Desktop

1 Answer

HP Pavilion a1150y fans run when powered on but windows doesn't load, monitor, mouse and keyboard do not work. (Running Windows XP)

Believe it or not, it's due to a weak power supply. More specifically, weak voltage rail/s caused by failing Electrolytic Capacitors.

A bad computer power supply is about 70% of computer failure.

ALL the light use less than 1 Watt. EACH fan uses 2 to 3 Watts.

A processor uses 55 to 125 Watts. Depends on the make and model.

Since the power supply is weak, it doesn't have enough power to turn the processor on.
No processor, nothing to find the Boot record on the harddrive. Nothing to get the Operating System going. (Example: Windows XP)

No computer running, there is no signal to the monitor.
Just enough power to light lights, and spin fans.

Apr 13, 2009 | HP PC Desktops

1 Answer

Power not on

  • First if you have move the computer recently, check that nothing has moved inside box and unplug cards if any including memery and replace again.
  • Check switch if working, does it turn on if you hold button? If so New switch required.
  • Most common problem: Power supply might be blown, see if the fan is running in the back of box when you start-up. Otherwise you will need to check a few things before you replace with new one. Check that the CPU fan inside box is running. Check that there isn't dust build up on fan stopping from running. Might need replacing. Try also taking out battery and starting up computer. If all else fails you will need to replace power supply with a 500watt or more power supply. If you have another computer on hand, you could try the power supply from that system as look as it has same connectors and try and run with that. If works then you know what to do. If nothing, the motherboard might be gone, or cpu even. Try also taking memory out and replacing. see if runs.
  • Before you give up, unplug all cables to hard drive, cd roms and DVD-rom and try to turn on

Aug 03, 2008 | Acer Veriton 7600GT PC Desktop

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