Question about Toshiba Satellite 1405-S151 Notebook

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Computer won't power up

The AC power supply does work. I checked it with my DVM and it puts out 12.5 VAC. When I plug the supply into the computer the left most LED on the front face, the one with the power cord symbol turns green and then it changes to a flashing yellow.

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  • Frank DeCesaro Jan 03, 2008

    Battery V and charger output are compatible. Thanks for trying.

  • Frank DeCesaro Jan 03, 2008

    Thanks. Will see if someone can look at it for an estimate



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I checked the toshiba site for information on your laptop, but there is nothing on your model.

I would say there will be something wrong with the power supply internally. I'm not too sure about laptops, but I think this is a small problem. You should take it to a repair guy and just get a preliminary report, before you spend money.

Laptops are quite cheap these days, so your decision is whether to repair or to repurchase a new one.

Posted on Jan 02, 2008

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First check the voltage on the batery and read the tag from the power suply make sure the voltage from the tag is the same to the output voltage because it looks like there is not enough voltage to charge the batery and does not work with the computer either

Posted on Jan 02, 2008


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Computer wont start 2

First post,

Plus I have read all the other posts up to this one.

The difficult thing to do, when trying to guide someone over the internet I have found; is Communication.

Whose fault is it when miscommunication develops?
No one's.

We have to simply strive to get our points across.
Both the person with the problem, and the person providing the solution.

With all due respect sir, you are not understanding; and your solution providers do not seem to be picking up on this.

Shall we begin again, fresh?

This is going to be long. You may have to walk away, then come back, and read it again. I need your patience. I can tell you are intelligent.

The reason it will be so long, is;
A) I have to explain what EACH, and every cable is.
B) I have to explain basic precautions.
C) I have to try to put us both on the same 'playing field'.

This is what I do Mateo, and I love it.

Moving on..........

1) That P4 power cable you are referring to, is a 4-pin ATX +12 Volt power cable.
It provides power for the Processor.
Yes sir. NEEDS to be plugged in.

2) The other cable you reference to, is a SATA power cable,

15 contact pins.
In comparison to a SATA data cable, it's connector is the larger of the two.
A SATA data cable connector has 7-pins,

This particular SATA data cable's connector, has a 90 degree bent elbow.
This style of bent elbow connector, is used to plug into the back of a Harddrive, or optical drive. (CD/DVD drive)

NOT always the case, though. A straight connector style can be used. A straight connector end is used to plug into the motherboard.
Also note the L-shaped opening.
A SATA power cable connector, also has this L-shaped opening.

You will also see these types of power cables,

4-pin Peripheral power cable.
Commonly known as a 'Molex' power cable. This is erroneous.
Molex was just the first company to make THAT connector.

Name stuck.
Kind of like calling an open-end adjustable wrench, a 'Crescent Wrench'

Those P1, P2, P3, P4, P5, etc, designations you see on the cable's connectors?

Doesn't mean squat to a tree.

WHAT, the power cables ARE, does.
Look at the connectors is how you find out.

Moving on............

I just saw you do something that could fry your computer out.
Power plugged into the computer, computer on, and your little hands IN the computer.

This = NO

The computer is Unplugged from power, BEFORE working on it.
ALSO,.....Anti-Static Procedures are followed.

Anti-Static Procedures:
Your body carries Static electricity. Static WILL fry out (Short Circuit), the delicate hardware components inside a computer.

RELIEVE your body of Static, BEFORE reaching inside your UNPLUGGED from power computer.

{Not 'shouting'. I am emphasizing}

Computer ON a table, computer Unplugged from power, computer case open;
TOUCH an unpainted surface, of the metal frame of the open computer case.

This action will relieve your body of Static.

IF, you leave your computer in the middle of working on it, be SURE to Touch the metal frame again upon your return.

Don't follow Anti-Static Procedures, and you can use your motherboard for a Frisbee.

(WHOA! Look at that THING go! ............whoops, sorry dog!)

You can also use the Processor for a neck trinket, and the Ram Memory for Christmas decorations.

Computer on, and unplug that 4-pin ATX +12 Volt power cable?

Good way to get a voltage spike, and fry stuff out.

Moving on.................

1) If ALL of those LED lights were on at once, they would use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power.

3) A typical Processor (CPU) can use 51 to 130 Watts of power.
Just depends on what Processor it is.

If you haven't caused a voltage spike, and fried stuff, and IF you have been following Anti-Static Precautions; just replace the Power Supply.

THAT, is your problem.

How do I know?
See what happens, when you plug the 4-pin ATX +12 Volt power cable in?
Power supply turns off.

That power cable is for the Processor. The hardware component that uses the most power.

Means your Power Supply has a weak voltage power rail.

Enough power to light those simpy LED's, and spin fans; but NOT enough power to turn the Processor on.

When diagnosing a desktop computer, the FIRST thing to check is the Power Supply.

MUST be known that it is good, BEFORE going on.

Before thinking about rushing out, and buying a replacement Power Supply, is there a working computer you can BORROW the Power Supply from?

Has to have the same case shape, and needed power cables.
Probably better have at least 250 Watts also.

Your Power Supply is an ATX form factor.

Size, and case shape of Power Supply, is;
Approximately 6 inches Wide.
Approx. 5 and 1/2 inches Long.
Approx. 3 and 1/2 inches Tall.

Plus the needed power cables. Look at your Power Supply now, and compare.

Not feasible for you?

Got $5 to $12 bucks you can let go of?
Then purchase a multimeter.
Auto parts stores have them, but more expensive.
I have seen them on checkout aisle racks, in major discount stores.

(Big Lots, wally world, Kmart, etc)

Then I will step by step you through using the multimeter, and checking each voltage power rail.

Your Power Supply (SMPS) is a Converter.
Converts the high AC electricity, in your home, or business; into
3 LOW DC Voltages.

(US = 120 Volts AC, Japan = 100 Volts AC, UK = 240 Volts AC, Australia = 240 Volts AC)

The 3 low DC voltages are;
A) 3.3 Volts
B) 5 Volts
C) 12 Volts

In comparison two D cell flashlight batteries produce 3 Volts DC.

ALL Orange wires are 3.3 Volts
ALL Red wires are 5 Volts
ALL Yellow wires are 12 Volts.

ALL Black wires are Ground wires.

This is a DC circuit.
The power wires listed above are Positive.
The Black wires are Negative.

I would like you to test the low DC voltages I stated,
Use a KNOWN to be good, Compatible power supply for a test unit.

This way you are not spending bucks for a Power Supply, and find out it MAY not be the problem; and be hatin' on me. lol!

Awaiting your reply,

(ATX12V is a 4-pin ATX +12 Volt power cable)

Mar 27, 2013 | Computers & Internet

1 Answer

Computer turns on, but screen says no signal

Computers send out a video signal.

If the monitor isn't receiving a video signal, you get No Signal on the monitor.

First thing to check is the monitor cable. Cable is used on another working computer to verify, or known working computer's monitor cable, is used in place of it.

I believe we can skip that.

eMachines are budget computers. Designed to save the consumer money, and give the consumer a decent computer.
Problem is low cost of computer, is due to certain hardware components inside the computer, are of low quality.

The Power Supply being one.
Dirty computer inside, also leads to early Power Supply demise.

You can;
1) Test the Power Supply with a multimeter. If you do not have access to one, economical models sell for around $5 to $12.
You will be testing three main voltages;
3.3 Volts, 5 Volts, and 12 Volts. All are DC Voltage.
In comparison two D cell flashlight batteries store 3 Volts DC.

[ Power Supply's are converters. They convert the dangerous high AC voltage (100 to 240. Depends on what country you're in), to the above low DC Voltages ]

Or do you have a KNOWN to be good, Compatible power supply; you can borrow from a working computer?

(I posted this one time, and the person posted back they had borrowed a Power Supply, from their aunt. Computer sat in the garage unused. When finished they returned the Power Supply. Put it back in the computer. Then went, and bought a new one )

Before performing the above, would like you to try this;

Unplug the computer from power. Press, and hold the Power On button in, for 10 seconds. Let go.
Do this same procedure two more times.
Continue also, until the Power On light doesn't briefly flash anymore.

Now plug the computer back into power. WAIT 1 minute.
Turn the computer on. The processor fan, computer case fan/s, and Power Supply fan; should race, (High idle speed), for a few seconds; then slow down. Let's see.

For additional questions please post in a Comment.

Also post the model number of the eMachines. Some examples, T1090, W3653, etc.

Nov 19, 2012 | E-Machines eMachines Desktop PC

1 Answer

Computer won't start up

Firstly check the power supply and all the cable are properly are plugged or not.
After check The SMPS FAN are working or not or cpu fan is working or not .
put out the ram and properly make it dust free. and after put is properly.

Apr 30, 2012 | Dell Dimension E521 PC Desktop

1 Answer

My computer won't turn on and when I plug it in the charging light won't come on

Please check the adpter output voltage with multimeter in DC mode.
If output voltage is good then check any contact problem of the power jack with laptop dc jack for proper contact.

Try to power on with only ac power supply by removing the battery.

Jun 14, 2011 | Computers & Internet

2 Answers

Have an Acer Aspire 5920-6470 that is dead. The power supply seems OK with the green light on and ~19 VDC on the DVM when checked. no power light on computer when plugged in, with or without battery. ...

Try remove the battery and unplug it from the AC. Hold down the power button for 35-45secs. plug AC back and see if you can power it back on. If not, the motherboard is shot.

Dec 29, 2010 | Acer Aspire 5920-6727 Notebook

2 Answers

How to I install Benwin 3d surround and subwoofer speaker to my PC

You should be able to plug them into your sound card. If an adapter is needed, they can be found at almost any electronics store.

Aug 31, 2010 | Benwin BWS30 Computer Speakers

1 Answer

2pin male connector of the motherboard (261671-001) purpose?

the switching power supplies are fun, by 2 pin plug is that from the AC side or computer side?

from AC side its easy enought to go buy another plug thought it should have come with one.

i cant remember any 2 pin plugs on the computer side and i have taken quite a few of these apart. there is a four pin plug...

wire colors,
yellow 12 volt
black ground
red 5 volt,

if the old supply was any of those colors you can desolder from the old supply and re solder it onto the new supply. if it was another color then i would suspect a random signal wire or cutout, keep you from frying yourself with the case open... try plugging up the new supply and turning on the computer if it runs why worry about it?

Jun 10, 2010 | Compaq (261671-001) Motherboard

1 Answer

Cpq321mm microinv. desk top speaker system . I need to know what voltage the power supply is as i have put mine in a box of 35 different ones

AC Adaptor Model RGA57122000 Input 120 VAC, output 12 VAC 2000mA. I have this very set and just now took the info off the unit.

Dec 29, 2008 | Micro Innovations CPQ321MM Computer...

2 Answers


Hi, the mA rating for this power adapter is 1500 mA !! I'm gonna give you all the specs. you need to order a new one, and I'm gonna tell you where you can order a new one at; at your preference ?

I/P(INPUT) 120 VAC 60 HZ / 23 VA
O/P(OUTPUT) 12 VAC 1500 Ma
This is all the info you need to order a brand new one in the box.
Go to and in your search box punch in the model # wk1201a5-1an. they cost 29.99 new but its worth it for a great sound system. good luck and I hope I helped a bit

steve - if you have any further questions, i will be glad to help out, you can email me

Aug 28, 2008 | Boston Acoustics MicroMedia Computer...

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