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I have a 90w ac/dc power adapter w/usb K33403. It has worked fine and someone tripped over the cord and the power adapter now makes a beeping sound whether it is plugged into the computer or not.

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Replace the adapter. They are relatively cheap and your problem is solved. Just do a search on Google and you'll find plenty of them available.

Posted on Jan 05, 2009

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Starts to power up then dies and blue light flashes every 10 seconds

The Asus Eee PC Top ET1602C All-On-One Desktop PC, is set up like a laptop.
All the hardware components are in the main unit.

This includes the Power Board. (Power circuit on the motherboard)
Part of the power circuit is the external AC adapter that you plug in.

Test the output voltage of the AC adapter.
Use a multimeter.
[An inexpensive multimeter can be purchased for as little as $5 to $12. Available in a multitude of stores. An auto parts store is but one example. Some chain stores have them in their checkout aisle racks]

AC adapter plugged into power, not plugged into all-in-one.
The center hole of the plug is the Positive connection.
The cylindrical metal outside shell is the Negative connection.

Function knob to DC Voltage.
[If just a symbol, it is a dotted line over a solid line. Fairly expensive multimeters have an auto detect feature, that senses if it is AC or DC]

Positive (Red) probe lead of multimeter goes to center hole.
Negative (Black) probe lead to outside cylindrical metal shell.
You should read 19 Volts DC.

Also while testing have an assistant gently wiggle the cable from AC adapter to all-in-one, and the power cable to AC adapter.
Fluctuation of reading indicates broken wire/s in that cable, or power cord.
Replace AC adapter if voltage low, or cord/cable damage.
One example from a quick search,

AC adapter checks out OK?

The port on the all-in-one that the AC adapter plugs into, is a DC Power Jack.
Suggest use the eraser on a No.2 pencil, and gently see if you can move the center pin around.
If so see if the center pin itself moves, or it seems the entire DC Power Jack moves.

Center pin moves indicates replacement of DC Power Jack.
Entire DC Power Jack moves, MAY just indicate the solder connections for the DC Power Jack to motherboard; may just need to be re-soldered.

DC Power Jack external inspection reveals it is OK?

On the motherboard are electronic components, that deal with the input DC Voltage.
Power MOSFETs, and Ceramic Capacitors to be more specific.

Using an ESD wrist strap, and having it connected to a good ground source, (Average price $3 to $6), the all-in-one is opened up, and electronic components are visually inspected.
Inspected to see if they are blackened, burned, or blistered.

Components are replaced if damaged.
If this is not in your line of expertise, then suggestion is to replace motherboard.

No not your motherboard. Just posted to give you a 'feel' what prices may be like.

Opening Case of All-In-One;
I do not have access to a direct Service Manual, nor have I worked on this model.
Very FEW all-in-one computer manufacturers EVEN post, any such information, and speaking of all; all-in-one computer manufacturers.

The usual route is to remove the Back Stand, then the Back Cover Enclosure.

Look for Philips head screws hidden under paper labels, or thin plastic covers; plus any visible screws when going to remove the Back Stand.
May also be a clip you depress after removing screws.

The Back Cover Enclosure is held on by Philips screws which surround it's outside perimeter.

(Suggest lay the LCD screen side down on a soft cloth, on a table to protect it; and be in the correct position for this procedure )

The Back Cover Enclosure also has Latches around the inside, of it's outside perimeter. These snap into Tabs located on the Front Cover Assembly.

Sometimes it's a lot of fun(?) trying to release these Latches.
A flat tipped screwdriver is used, with EXTREME caution.
The tip is ONLY inserted just so far, and the prying action is used with finesse.

[BETTER tool to use is a Spudger Tool, ]

If the screwdriver does not insert at the point you are trying, it may be because you are at one of the Latches. Move over.

Finesse is used, because the Latches are now brittle from over time, and constant heat from inside the computer.
Even if you use great finesse, do not be surprised if a few of them get broken.
Tech or not, brittle plastic breaks.

It will be OK as the Philips head screws will 'keep everybody together'.

Guides using HP/Compaq All-In-Ones as examples. Glean from them in opening yours, (Ones that are listed as All-in-ones),

Note that everything comes off in 'layers'. Metal static shields, optical drive, harddrive, etc.

To replace the LCD screen for example, you have to completely disassemble from the back to the front, then you can access the screws which hold the Display Screen Bezel in place. The Screen Bezel is removed, THEN the LCD screen can be removed from the front.

[Watch me be mistaken with this model, and there IS a way to access the LCD screen from the front, lol! ]

Here are basic examples of components on the motherboard, that you may find to be bad,

Average cost of a Fairchild Semiconductor - FDS6679 - Power MOSFET,

One dollar, and one penny, USD.

Average price 63 cents to 80 cents USD.


Oct 12, 2012 | ASUS Eee Top ET1602C (ETP1602CBKX0163) 156...

1 Answer

My HP xw4300 does not start?

What happens when you hit the power button to start it?

When you plug in the power cord is there any lightswhatsoever on the laptop, where the plug goes in or on the AC Adapter of thepower cord?

When you press the power button do you hear fans running, hard drive spinning,lights on the computer, hear any beeps or lights constantly blinking, hear theDvD/CD drive click and the light on the drawer of the DvD/CD turn on for asecond or two? If so the laptop is trying to boot or may have booted, butthe screen is not showing for some reason.

Beep tones and blinking lights tells the technicians what is going on with thelaptop and why it is not booting. Most times it's a motherboard issuewhen you hear beeps or blinking lights continuous.

Maybe your power cord is bad if you don't get anything to happen whatsoeverwhen you press the power button. And if that's true maybe you wasoperating off the battery the last time you had it on and since the power cordis bad, it was not charging the battery so the battery is drained and the powercord is bad.

Maybe you have a Static Charge Buildup. Remove the Power Cord, Remove theBattery, then Press and Hold the power button for 30seconds. After 30 seconds plug the power cord back in (leave the batteryout) and hit the power button to see if it boots. If it does, you can putthe battery back in and let it charge.Maybe your DC Power Jack which is where the power cord plugsinto the computer is bad. Take an ink pen and push the tip inside thejack and see if the little pin wiggles, if so the jack is bad. You'll have totake the laptop apart to fix it. Most times it is soldered onto themotherboard, so you will have to desolder the old and solder a new one.

Apr 02, 2012 | Computers & Internet

1 Answer

My computer does not start up looks like in satnd by mode

Most All-in-One Personal Computers (PCs) are based on internal laptop/notebook component technology.

The first item to test is the Alternating Current (AC)/ Direct Current (DC) Power Adapter to see if there is:

damage or a fault in the cabling;

damage or a fault in the transformer box;

a fault, damage or a loose connection in the AC/DC Adapter Jack point via which the AC/DC Adapter plugs into the PC.

If no AC/DC Adapter-related fault is evident or any such fault is definitively resolved (such as by testing a definitively functional replacement AC/DC Adapter), then his sounds like either a Loose AC/DC Power Jack detached from or short-circuiting its Motherboard Solder Points, a Power Management problem on the Power Management Tracks, Electrolytic Capacitors or Power Management Contoller Integrated Circuit (IC)/Chip on the Motherboard or a Graphics Chip or Graphics Card damaged surface or Motherboard Solder Point Contact fault.

Any of the 3 internal faults described above would require specialist internal diagnostics, repair and testing by a technician with specialist laptop repair experience and specialist Infra Red Workstation, BGA Reballing StationMicro-Soldering, Oscilloscope, and Multi-Metering equipment.

DC Jack repairs are likely to be moderately expensive. Power Management or Graphics repairs are likely to be more expensive still, but if conducted by a professional, all three repairs should resolve the problem. A competent repair technician should be able to repair these faults and offer a minimum 3 month warranty on a reoccurrence of the same fault.

So, on the symptoms described in the question, yes. Unless it is just an AC/DC Adapter fault, this will probably prove to be a serious, non-DIY repair problem, I'm afraid.

Dec 04, 2011 | Acer Veriton Z431GUi5650W 215Inch AllInOne...

1 Answer

My gateway laptop note book, will not power up, I have checked the cord, battery etc. Went to turn it on one day and no power? someone mentioned that it over heated?

First of all, take the battery off and try to turn it on with the ac adapter (power cord) connected. If it comes up without the battery then it's your battery.

If it doesn't turn on without the battery and with just the ac adapter, try a different ac adapter. You can find one to try at your local pc shop or electronics store. If it comes up with another ac adapter then all you need to do is purchase an ac adapter at the store or order one online (cheaper).

If it still doesn't come on then it's either your dc jack or your motherboard. Normally if it's just the dc jack it will turn on or attempt to turn on when you wiggle the connecter in the ac adapter connection. If it's your dc jack it's relatively inexpensive to purchase online. The problem comes with having to take apart the laptop, desoldering the old and soldering the new dc jack, and putting the computer back together.

Good luck and let me know if you have any other questions.

Oct 23, 2010 | Computers & Internet

1 Answer

Power button blinks slowly and machine wont turn on

does it make any beeping sounds? try unplugging all peripherals like keyboard, mouse, usb devices etc, just leave the monitor and power cords and try powering it on again. If it is beeping give me the number of beeps and frequency.

Aug 08, 2009 | eMachines Computers & Internet

1 Answer

Hi; I Have a Dell XPS 1530 which is dull if I do not have it plugged in. I have three Targus power cords and cannot use any of them. The one that has the S35 tip fits, but only engaged...

I am showing the AC adpater specifications as:
Input Voltage Range: AC 100V - 240V
Output Voltage: DC 19.5V
Output Current: 4.62A
Power: 90 Watt
Does your adapter meet those specifications?
Although I am a proponent of Targus products, possibly purchasing an OEM adapter may solve the problem. We have successfully purchased ones available from reputible vendors on eBay at a discount.
Have you checked to always show the battery status in the system tray so that you can verify when the AC adapter is actually charging versus an intermittent connection or malfunctioning power socket?

Oct 22, 2008 | Computers & Internet

1 Answer


I hate to ask this, but I have to..... Is there power at the wall outlet? Okay, now that the stupid question is out of the way (you'd be surprised how many service visits I've made for this)

make sure the AC cord between the wall and the transformer is in good shape and securely connected to the transformer. If you have a voltmeter, measure the voltage at the transformer end of the AC cable and make sure you have AC voltage there

If there is a light on your power adapter transformer, see it it is on.

If there is a light, and it's not on, but you have voltage at the AC cable, then the transformer is not working and must be replaced.

If there is no light or the light is on, check the DC voltage at the power connector that plugs into the laptop. The correct voltage should be written on the transformer casing.

If you have voltage there, then your battery may be faulty. Otherwise there is a problem with the circuit between the adapter inlet on the laptop and the battery.

Sep 05, 2008 | Sony Computers & Internet

1 Answer

The AC adapter that I brought from Best Buy doesn't have enough power to get my computer to- charger-up. The S/N of my computer is T3A6931000974. The tec from best buy said that the adapter didnt have...

Looks like a 90 watt AC adapter will do what you need

Sep 05, 2008 | Gateway Computers & Internet

2 Answers

Acer L5100 install problem

I think it would get power through the Moniter so I don't think you need a power cord for the CPU. Hope this helped =)

Feb 25, 2008 | Computers & Internet

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