Asus K54C note book will not boot

My son's laptop will not boot.  He is saying the keyboard lights come up but nothing is happening.   His power cord didn't work and he purchased the wrong cord and not has the correct power supply.  

I thought it could be the CMOS.  He is telling me he can't find it.  

Any suggestions?
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Scott Fell, EE MVEDeveloper & EE ModeratorAsked:
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Rob MinersCommented:
Check to see if the new AC adaptor Output = 19 V DC, 3.42 A, 65 W
                           Input : 100 -240 V AC, 50/60 Hz universal

Test the old AC adapter with a voltmeter/multimeter. Make sure the AC adapter outputs correct DC voltage which should be listed as Output on your AC adaptor. Set the voltmeter/multimeter to 20 Volts DC as your AC adaptor is listed at 19V DC and then check the reading. The Red probe normally goes into the plug and the Black probe touches against the metal outside of the plug.
Positive + and Negative - connectors should also be listed on your AC adaptor.
If the voltage seems to be intermittent, or a very low reading, your AC adapter may be damaged and should probably be replaced.

Disconnect the AC power, remove the battery pack, press and hold the Power button for 20 seconds. Re-insert the AC adapter and see if it will power on.
Disconnect the AC power, remove the Battery pack, remove and clean the golden edge of each Memory stick with a soft white rubber/eraser, remembering not to touch the golden edge of the Memory stick.  Re-insert one stick at a time to test. Re-insert the AC adapter and see if it will power on.
If no success temporarily disconnect the Hard Drive and see if it will power on as there may be a failure within the circuit board or component.

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maybe you'll want to use my troubleshooting chart :
here my laptop troubleshooting guide, i hope it helps you :
- remove all external devices
-you can disable devices from BIOS to test (sound, lan, etc..)
- if no display - test with an external monitor
- test if it runs from battery alone, or from AC alone
- test also with a known good battery !
***some laptops have a reset button - if you have one use it!
- remove battery and AC adaptor, hold power button for 20 sec, connect AC and reboot --> any display ? if NO -->
- disconnect all disk and cd drives, battery , and other cards and peripherals, leave only 1 ram stick
- boot -->any display ?
-if you can access the bios battery, remove the battery, AC, and bios battery for a minute to reset the bios
or test it, it should read 3 V
*** you can test the disk on another pc, if you like !

===>>you can test if the mobo works outside the casing, connected to power and external video  !

you can also remove and reseat the video plug - it sometimes comes loose

for troubleshooting the display (LCD) problems :

***ps measuring the DC output of the AC adapter is a good first step - but does not tell you if it works under load; you can test the laptop with another AC adapter, or test the adapter on another laptop to be sure!
Scott Fell, EE MVEDeveloper & EE ModeratorAuthor Commented:
Thank you.    Both good suggestions.  When he gets back home from work I will have him try this.
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Joe Winograd, Fellow&MVEDeveloperCommented:
> not has the correct power supply

Hi Scott,

I have two ASUS K54C notebooks (one with W7, the other with W8) and would be happy to run some tests if that would be helpful. As I'm sure you know, using the incorrect power supply can fry a computer, so that may be what happened to your son's machine, but I don't know how to determine that. In the event that it helps, here's a photo of my K54C's power supply (it's the same on both machines):

ASUS K54C power supply
Regards, Joe
Scott Fell, EE MVEDeveloper & EE ModeratorAuthor Commented:
He is saying the keyboard lights are on and the charge indicator light is on or meaning it has been charged. But when he tries to start the screen remains black and nothing happens.    I don't know for sure which power supply he used first.   I have to wait until tonight.
Rob MinersCommented:
A couple of extra things to try

If the Notebook is plugged into an AC outlet, verify that the AC outlet is providing adequate power by plugging another electrical device into the outlet.
Check the movement of the Lid Actuator switch, the Lid Actuator switch is a small button or switch located above the keyboard near the hinge for the LCD. Pressing this switch 2-3 times when the computer is on may turn the notebook display back on.
Scott Fell, EE MVEDeveloper & EE ModeratorAuthor Commented:
Thank you all for good options.  Nothing seemed to work and he picked up a new one.
Joe Winograd, Fellow&MVEDeveloperCommented:
You're welcome, Scott. That's a shame about the laptop. I wish him better luck with the new one. Regards, Joe
Rob MinersCommented:
You're welcome, Scott and ditto what Joe said.

Regards Rob
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