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Computer doesn't switch on!

Hi, my advent computer will not switch on anymore... i've checked cables fuses etc and changed the power supply but this did not help, any assistance will be greatly appreciated! thanks replaced memory on an Insigna D500a and now computer doesn't come back. board LED an all lights are on but monitor and keyboard remain blank. any suggestions??

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The troubleshooting techniques you might try is swapping them out with another monitor and keyboard. If they work then you know its the monitor and keyboard if they don't work then the motherboard is bad. The ports for the keyboard and monitor are integrated into the motherboard. So you can't fix the ports, the whole motherboard has to be replaced.

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Posted on Jan 31, 2009

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What fuse is in a Enermax EG495P-VE Noisetaker 485W Power Supply

Just buy a new power supply. If you touch the wrong thing inside that psu you will die. Seriously.

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Need a 200W+ power supply for a HP774y Pavillion Desk Top computer. It must have the dimensions 4 x 3.5 x 6 ish. the cables must come out on the right side (when viewing the fan opening side. Neither...

FixYa is a product support website, and not a manufacturer. No we do not have the part.

From a quick search this website does,

[ If it were I, I would change the computer case, so I could use a standard ATX form factor power supply.
Cheaper, more reliable, more wattage, and high quality MosFets, Capacitors, Rectifier Bridge, and other associated SMPS parts are used.

{Switched-Mode Power Supply,

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For additional questions please post in a Comment.


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No power when I switch on computer. Fan not running, power light not coming on. Have tried plugging in to different socket. Still nothing. Taken case side off, double checked all fittings. Cleaned computer...

If you know the receptacles that you have plugged the computer into, indeed have power, I would suggest you diagnose the Power On switch, and the Power Supply.

See of the problem is the Power On switch, or the Power Supply.

A jumper wire is used on the main ATX power cable.

1) If the Power Supply comes on you have a bad Power On switch.
2) If the Power Supply does Not come on, you have a bad Power Supply.

Your problem is posted in the eMachines Bestec ATX-300-12E power supply section.
Going with that we are discussing a Bestec ATX 300 watt power supply, the main ATX power cable is a 20-pin ATX main power cable.

Typical pinout of a 20-pin ATX main power cable,

Note the Green wire in the BACK of the connector, in the photo to the far right.
This is the Soft Power On wire, or also abbreviated as the PS_ON wire.

Note the Black wires. ANY Black wire is a Ground wire.

With the 20-pin ATX power cable plugged into the motherboard, as shown in the photo, a jumper wire is touched to the Green wire, and to ANY Black wire.
The computer (Power Supply) is also plugged into power.

Generally a paper clip is used for the jumper wire.
The paper clip is straightened out, then bent into a U shape.
Black plastic electrical tape is then wound around the middle of the U shape.
This taped area is for your fingers, and thumb to hold onto.

The 'legs' of the paper clip, are then inserted down into the socket holes, in the back of the 20-pin ATX main power cable's connector.

Down into a socket hole with the Green wire, and also into a socket hole with ANY Black wire.
The 'leg' of the paper clip goes down into the socket hole, RIGHT NEXT to the existing wire.

At the end of every wire in the 20-pin ATX main power cable, is a metal terminal end.
The metal terminal end is pretty far down in the socket.
You must ensure that the metal end of the paper clip, touches the metal terminal.

The voltage is 5 Volts DC.
Two D cell flashlight batteries produce 3 Volts DC.
There may be a small spark as you make the connection.

Warning you in advance.
You can see the voltage is VERY low, however.

I would like you to perform this test, then post back in a Comment as to your findings.


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Hi there PSU Stopped working. Dismantled and found fuse blown. Replaced with new fuse, which blew straight away. Any ideas as most likely component that has failed / needs replacing?! Regards,...

Follow these steps :
Power on your computer and place one hand behind the power supply's fan on the back side of the computer case. Check to see if there is any air being blown by the fan and listen for any fan noise, which will both indicate the power supply is still receiving electricity. Turn off the computer.
Remove the power cable from the current wall outlet it is plugged into and connect it to a different outlet to make sure the outlet isn't the cause of the problem. Replace the power cable entirely with a new one and plug it into the original wall outlet to find out if the cable was defective.
Power on the computer and check to see if the problem still persists. Turn the computer off if you are still having problems and disconnect all of the cords from the back of the case. Set the computer down onto its right side on any nearby stable work surface. Unlock the left side panel from the computer by removing the two case screws on the back end of the case. Push down on the panel slightly and then slide it away from you to remove it from the case.
Make a visual inspection of the power supply, which will be located at the top left side of the case. Check to see if the power supply has sustained any obvious physical damage such as from spilled liquid or possibly falling out of the drive bay. Replace the power supply if there is any obvious physical damage.
Check the connections of the IDE cable that run from the motherboard to the power supply. Make sure the connection is secure at both sides and hasn't slipped out. Replace the IDE cable with a new one if it has any obvious physical damage.
Unplug the cord that runs from the power supply to the hard drive. Turn on your digital multimeter and set it to the "DC" setting. Attach the power cable back into the power supply with the case still open. Press the computer's power button.
A Digital MultimeterInsert the multimeter's black probe into the black wire of the power supply cable you removed from the hard drive. Take the multimeter's red probe and plug it into the yellow wire of the power supply cable. Check the reading that appears on the digital multimeter's screen.
Replace the power supply if the reading on the multimeter is lower than 11 or higher than 13.

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I'd check into a DiabloTek PHD650 650-Watt Power Supply. It's a higher voltage module, but has similar features to your Enermax power supply. If you can't find it locally, check out (my fave) or These two sites are likely to have these, and are competitively priced.

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1 Answer


Check the power cable/cord for continuity with your multimeter ok. Make sure also that the mains or power outlet is giving the right voltage. This is also done by the use of the multimeter - either analog or digital - any one at your disposal can do ok. if all work well, then the power supply unit should be removed from the system unit, connected directly with the power cord and then bridged. That is at the secondary output which connects to the system motheboard. Locate the power-on cable(normally green in colour) and bridge it with any black cable on the same row. The cooling fan at the back of the power unit should be rolling if the unit is ok. Good luck

Jun 03, 2009 | Compaq (243890-001) 250-Watt Power Supply

1 Answer

Pc wont turn on

1. Remove all USB devices such as printers, mp3 players etc etc.
2. Remove the power-cable and the battery
3. Press and hold the power button for 30 seconds
4. Put the power-cable back in but not the battery and none the USB devices.
5. Turn the computer on

Also check the condition of the USB ports if it doesnt work and the fuse. If this doesnt work then I would recommend a repair.

Jan 19, 2009 | Computers & Internet

1 Answer

Computer will not power up.

Check the fuse, if thats ok then try this -

1. Remove all USB devices such as printers, mp3 players etc etc.
2. Remove the power-cable and the battery
3. Press and hold the power button for 30 seconds
4. Put the power-cable back in but not the battery and none the USB devices.
5. Turn the computer on

Jan 18, 2009 | Computers & Internet

3 Answers

Computer doesn't switch on!

More than likely nothing to do with the motherboard.

I have the Thermaltake w0049. and for the money paid is poor quality.
This model and I would guess other models by Thermaltake go belly up if subjected to voltage spikes ie lightening strikes (they are not well protected)
Remove all the leads to your motherboard and join together the single green wire (power select) to any one of the adjacent black leads (ground).
Any atx supply, if connected to mains voltage will not operate at all unless if has some form of load on it. if you do the shunt as suggested(use a paper clip) the fans should spin and you should be able to measure the voltages between ground and the relevant pins.
If you can, plug in a hdd to one of the plugs to give it some kind of load. if you do not know which voltage pins are which on your 20/24 pin connector , then search google for "atx pinout"

Dec 21, 2007 | Computers & Internet

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