ACER Aspire L100 Desktop is dead?

Try removing/disconnecting the hard drive and see if the BIOS boots up, if it does the HDD is causing the problem. Are you getting any beeping codes on start up, if so how many and hoe long in between?

The Acer Aspire L100 is a desktop computer powered by a special DC adapter and power cable. The computer's motherboard incorporates a fuse designed to prevent any power surges from damaging the computer. If the fuse burns out due to a power surge or for any other reason, the computer will no longer function. You can check the motherboard fuse for damage yourself, then take it to a trained technician for replacement if needed

Shut down the Acer Aspire L100 and turn the tower around.

Press the "On/Off" button on the front of the tower. If the computer will not boot and the fan does not turn on, the fuse may be burned out.

Unplug the power cord from the rear of the tower

Turn the tower on its side and remove the Phillips-head screws connecting the back panel to the Aspire L100's cabinet.

Pull out the motherboard assembly gently from the back of the cabinet. The internal fuse is located on the motherboard behind the DC power jack, which is to the right of the monitor jack

Let me know if this helped..

2 Press the "On/Off" button on the front of the tower. If the computer will not boot and the fan does not turn on, the fuse may be burned out.

3 Unplug the power cord from the rear of the tower.

4 Turn the tower on its side and remove the Phillips-head screws connecting the back panel to the Aspire L100's cabinet.

5 Pull out the motherboard assembly gently from the back of the cabinet. The internal fuse is located on the motherboard behind the DC power jack, which is to the right of the monitor jack.

Read more: Fuse Location on Acer Aspire L100 ' eHow.co.uk http://www.ehow.co.uk/how_7815704_fuse-location-acer-aspire-l100.html#ixzz1XUVwmxuA

3 Unplug the power cord from the rear of the tower.

4 Turn the tower on its side and remove the Phillips-head screws connecting the back panel to the Aspire L100's cabinet.

5 Pull out the motherboard assembly gently from the back of the cabinet. The internal fuse is located on the motherboard behind the DC power jack, which is to the right of the monitor jack.

Read more: Fuse Location on Acer Aspire L100 ' eHow.co.uk http://www.ehow.co.uk/how_7815704_fuse-location-acer-aspire-l100.html#ixzz1XUVwmxuA

Have you tried to remove and re install the video card also try and move it another bus slot on main board. Do you get anything at all on the screen when it first boots

You may need a new power supply....also check your internal fans to make sure they are spinning. Make sure memory is seated properly. Motherboard may also be in question. Try unplugging letting it sit for a few then plugging back in.

Do you see anything on the screen?

Try the following things:

1. Try starting the computer with only the battery
2. Remove the battery and try booting with only the power adapter
3. Try removing and replacing your memory
   

Could be a bad power supply or bad battery. After you try the above steps, report your results.

press f8 during boot

Does your laptop beep at all when you turn it on?

Try unplugging the laptop and removing the battery for 5 mins, then try again.

If you have another monitor you can use, plug it in to your laptop and see if you can get a display on it.

Press the FN F5 screen to see if you can toggle the screen on. If you have a external monitor plug it in to the notebook and see if you have video. If it show in the external monitor your LCD screen has gone out.

I hope this helps.

Try Screen switch function to switch from Internal screen to External monitor to Both.
Normally FN + F4 (on Compaq or FN + F7 on Lenovo check the Function symbols on your Keyboard: allow few seconds after command to refresh configuration.
try Safe mode also. to check if display shows in VGA format.

go into the BIOS and disable the smart fan. The next boot will allow the fan to run at full speed, approx 7200rpm instead of 2800 rpm and the machine will not overheat. However, its will sound like an aircraft on takeoff!