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Released in 2013, the Asus X550C is a line of budget Windows 8 ultrabooks. Related model numbers: X550CA, X550CC, and X550CL.

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The computer does not turn on

When I turn on the computer with the power button, the power light and another num look light come on, and the screen remains off I would appreciate an answer Thanks in advance

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It sounds like a display issue. Have you tried plugging in an external monitor? That should help pin down the source of the problem as to whether it's a motherboard or LCD issue.

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I connected the computer to an external monitor and it still doesn't work

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Hi @elchanan1

Try a power refresh in case a corrupted BIOS is the cause of the problem.

Disconnect the charger from the laptop (if connected) and then remove the main battery from the laptop.

Press and hold the laptop's power on button for a full 30 seconds and then release it.

Reinsert the main battery, reconnect the charger and try turning it on¹.

If it still won't turn on you may have to try a full power refresh. This involves removing the RTC coin cell battery from the motherboard. This battery maintains the BIOS settings when the laptop is turned off. It is a non rechargeable 3V Lithium coin cell battery that usually lasts for ~5 years. When this battery's voltage drops then there's a chance that the BIOS can become corrupted preventing the laptop from starting normally.

Unfortunately for you, this battery is mounted on the underside of the motherboard, so the laptop will have to be nearly completely disassembled to get to it.

Below is an image taken from this teardown video showing the location of the battery on the board.

Once the battery is out, measure its voltage. If it is <2.4V DC or >5 years old replace it. Remember to reinsert the battery the correct way i.e. +ve on top as marked on the battery. Usually the battery type number is stamped on the battery. If looks like it is a CR2032. If this is the case then these are commonly available most everywhere, e.g. supermarkets.

Reinsert the RTC coin cell battery, reassemble the laptop, reinsert the main battery, connect the charger and check if it now turns on OK¹

¹ If it turns on OK there may be a message stating that the date and time are incorrect. This is normal as the BIOS has been reset back to its factory default state. Once the date and time have been corrected the message won't appear the next time that the laptop is started. Also any user definable BIOS settings that were changed by you to suit whatever operating requirements you wanted, will have to be changed back again as well.

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Update (03/06/24)

Hi @elchanan1

Here's the schematic

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3 Comments:

@jayeff

I did everything and it still remains the same

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@elchanan1

It's looking like a motherboard problem.

Perhaps make the laptop very basic, i.e. remove the HDD and 1 ram module (if there are 2 modules), connect the charger and check if it turns on at all e.g. logo on screen.

If not, turn of the laptop and remove the ram module and insert the other one instead and try again.

If still no good you would need to find the motherboard schematics to start finding out what the problem is.

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@jayeff

Where do you find a schematic for a computer?

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There are more clues you can get from more observation.

  1. Do you hear the fan running at all, or feel any breeze?
  2. If you have an HDD, when you turn it on do you hear the HDD doing its POST?
  3. Does the drive LED blink at all?
  4. Does it continue to blink?

1 = no, power failure

2 = no, HDD failure, power failure, MB failure.

3 = no, MB failure

4 = no, corrupt HDD, RAM, MB

If MB failure is suspected, start by feeling parts to see if any are stone cold or very hot.

If it is cold, it isn't working. Likely suspect would be the CPU.

Then remove RAM.

Then consider changing out the CPU.

Then consider buying a new computer. It gets uneconomical at this point.

A bad BIOS battery won't stop the computer from booting, but things will get strange and programs might not work.

A corrupt BIOS won't affect 1 or 2 above, but may affect 3 & 4.

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4 Comments:

@ruggb

1. The fan does not turn on

2. The drive is an SSD so you don't hear any noise

3. The light turns on for a second and turns off and does not turn on again

4. No

I tried replacing the RAM and the drive and it didn't help

But there is RAM soldered to the board so it could be damaged

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When that happened to me, the problem was a shorted CPU. The computer shuts down because the CPU draws too much current. I replaced the CPU and all was well.

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@ruggb

But the CPU is soldered to the motherboard, is there a way to replace it alone by soldering without replacing the entire motherboard?

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On my Dell (old) it was socketed. If it is soldered on yours, that would be a show stopper without the right tools and experience.

May be time for a new option.

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Well you can try the following:

  1. Try a different power source.
  2. Check your monitor connection.
  3. Disconnect your devices.
  4. Listen for beeps.
  5. Start your PC in safe mode.
  6. Restore your computer to previous settings.
  7. Check for unresponsive apps.
  8. Unplug USB devices.

for more assistance check out the following: https://www.youtube.com/watch?v=_MOe71kB...

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@gtip

1. The computer does show that it is plugged in and its charger works fine on another computer as well

2. I already wrote that I tried to connect it to an external screen and it didn't help and the fan didn't turn on either

3. As mentioned, no external device is connected to it and as I said I even tried to replace the RAM and the computer drive

4. The POST does not beep on laptops

5. As mentioned, the computer does not turn on at all, so how do I turn it on in safe mode?

6. As mentioned, the computer does not turn on at all, so how do I reset the settings? If it's through the bios battery, I've already tried to do it as I wrote before

7. As mentioned, the computer does not turn on at all, so how do I test an apps???

8. No USB device connected

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Elchanan Blumenfeld will be eternally grateful.
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