Question about Acer Aspire™ T180 PC Desktop

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PC won't 4power on.

Swapped out power supply with known good one and tested both with power supply tester. Both tested identically even 12v 4pin connector, drive power plugs and 3.5" power plug.  PC won't power on, no drive lights, not bios screen, nothing.  Green LED on mother board is lit.  

Had same problem with 4 year old eMachine and now this Dell 2400 which is a Celeron also.

Is there anything else besides taking out all peripherials and disconnecting all power connections to drives?  Is the only diagnosis that the mother board has failed?

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  • Steven Schultz Jan 03, 2009

    Thank you for the good advice.  I try those things.
    Thanks!

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Failures in the motherboard, memory, or any installed card could cause that symptom. All I can suggest based on the above information is remove memory one piece at a time and retest, remove/reseat video card if you have one, and attempt to reset the CMOS using the jumper on the board. You might also try removing the battery on the board and unplugging everything, then attempt to reboot.

Posted on Jan 03, 2009

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Dell can’t find the Hard Drive,Tried everything with the Original,Swapped Drives with 2 Others.I Also swapped SATA, Power Cable ,Drive Not in Bios Get Error on Start No Drive Found Any Ideas Anybody?


Herculesx , Have a look at https://www.youtube.com/watch?v=bhGDBivOrDE and https://www.youtube.com/watch?v=RB0LRnJB1Bo in case you missed some important step.Trouble shoot process.
Why are you changing out the hard drive in the first place.?
Maybe the power supply unit is faulty and not proving power to the hard drive. This could be checked with a volt meter on the power plug to see if 5v and 12v dc voltages exist on the power plug when the power is turned on. Hopefully you have not zapped the hard drive circuirty via static electricity or from removing hard drives while the power was on the computer.
or
Maybe the power plugs are not pushed in hard enough into the hard drives when installing them ?
Good luck with your problem hope it is a power problem.
Another possibilitity is the Bios is not capable of handling the size of the hard drive capacity
http://www.seagate.com/au/en/support/downloads/beyond-2tb/

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On my computer, how do i know whether my switching power supply or my motherboard are faulty ?


As with most PC hardware problems, if the problem is persistent, just swapping out the suspected part with a known good unit can tell you right away if that solved the problem. You can also test a power supply with a power supply tester. They range in price from around $10 to more than $100. However, unless you plan to go into the PC repair business, spending that money on a replacement power supply might be a better investment. Even if it doesn't solve your immediate problem you might need a good spare at some point in the future. Most PC power supplies are interchangeable. Just buy one with a high power rating (500 watts is good for most consumer PCs). Some mother boards provide utilities in the BIOS that display voltage level and power fluctuation measurements. If your motherboard offers that feature and it shows your power is suspect, you don't really know if a component on the board is the culprit or the power supply is failed, but this could be a way to confirm if swapping out the power supply restores the power to proper voltages, etc.

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No power flashing green light


there seems some problem with ur smps or remove recently installed hardware

May 22, 2010 | HP Pavilion A645c PC Desktop

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I turn on the power of my computer and it shows the compaq name then goes to a resume windows that is highlighted and when you click on it the screen goes black and the computer does not load


I suggest you have Power Supply problems. A failing power supply will emulate all kinds of software problems.

Let's start with the easy stuff first.

How dirty is the computer inside, and the Power Supply? Has the inside of the computer, and the Power Supply, been cleaned on a regular basis?

(Computer off, and unplugged from power, computer case open. A can of compressed air is used to clean)

From there I would suggest testing the Power Supply, (Requires a multimeter, or a power supply tester), or replace the power supply with a known to be good unit, for a test.

To summarize:

Let me know if the computer is dirty inside, and if you need guidance on how to clean it. (Power Supply also)

From there, if you wish I can guide you on testing your power supply, or replacing with a known to be good unit, for a test.
Simply state in a Comment.

This is HP Support, and the download page for a manual which instructs on how to open your computer case, (Page 118)

With this manual I can also guide you in replacing the power supply.

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&lang=en&product=326832&

Why do I think it's a power supply issue?

You don't have enough power to turn the Processor on.
Power Supply's are rated in Wattage.
Voltage times Amperage = Wattage.

1) ALL the lights require less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts of power.
3) A typical Processor requires 51 to 125 Watts of power. Depends on what processor it is.

The Compaq Presario S4020WM Desktop PC, comes with an AMD Athlon XP 2400 processor. (2.4GHz)
When operating at full capacity, this processor can use up to 68.3 Watts.

http://en.wikipedia.org/wiki/List_of_AMD_Athlon_XP_microprocessors

You have enough power to turn on lights, and spin fans, but not enough to turn the Processor on.

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Powes ups then dies


Do a visual inspection of the Electrolytic Capacitors on the motherboard first.

Then check the power supply with a power supply tester, (About $15), OR replace the power supply with a known, good one for a test.

Visual Signs of Capacitor Failure, http://www.capacitorlab.com/visible-failures/index.htm

Want to know more just state so in a Comment.

Feb 16, 2010 | HP Pavillion s7420n PC Desktop

2 Answers

My presario sr5510F does not power up. The power


Off the bat it sounds like a bad power supply, even if it is a new one.
Even though it's a new power supply, you can buy a dud sometimes.

Could be that there are Electrolytic Capacitors on the motherboard, that have dried up inside, and will show no obvious visual signs of failure.

Let's go back to basics, and get that power supply to fire up first.

1) Once, with no power cables of the power supply attached to anything.
2) Then after this test, power cables are attached to the motherboard, and all the other hardware components.

Will advise right now, that just because the power supply may come on, without the power cables attached, it does Not mean the power supply is good. The power supply may have one, or more weak voltage power rails.

No offense meant of any kind, but if it's a cheap power supply, the chances of it being a dud straight out of the box, are great.
Cheap Electrolytic Capacitors are used, (among other cheap components, and gauge of wiring), and these have a high failure rate. They break down just from sitting.

You may want to buy an economical power supply tester, ($12), to test the power supply, unless you have a multimeter available. I can walk you through testing with it.

This is an example. It is not an advertisement for said manufacturer, nor website,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1647108&CatId=1107

Basic information for the above power supply tester,

http://www.pcper.com/article.php?aid=246

To turn the power supply on without it being hooked up to the motherboard, you have to use a jumper wire to turn the Soft Power On.

I will detail this method out, after you have replied to the bottom of this solution's question.

We can do the two tests above without the power supply tester, or multimeter, But,

IF, the power supply fires up without having any power cables plugged in, we go to having the power cables plugged in, and using the jumper wire method.

IF, the computer does not start up with the power cables plugged in, and using the jumper wire method, we need the power supply tester, or a multimeter.

IF, the computer fires up with the power cables plugged in, and using the jumper wire, you need to replace the Power On switch.

Do you wish to proceed?

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I had two bad PC's One would not power up. Thought power supply. Took out identical power supply from the other bad PC. Still would not power up. I fiqured bad mother board. Put the power supply back into...


Ensure the power supply at the wall is good, ensure all plugs of power supply are plugged into Mobo, especially the CPU pwr supply if it has one. You really need to know 100% if the power supply you are using is good. If so and absolutely no boot. HDD activity then I would first suspect ram then CPU then mobo. Simply remove / replace ram, sometimes fixes them.

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I'm trying to trouble shoot a PC power supply. I want to know which pins to jumper (short) on the EPS12V cable connector (4 pin, 2 yellow, 2 black) to turn the power supply on (on the bench).


hello sir, hi, ITS NOT THE 4PIN You will jumper short to test the power supply, bu the green one to be shorted to the black one. They are located on the 20/24pin power connector.

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Need2 know wiring diagram 4 power supply 4 a emachine T2642


Hi there
The power supply should be ATX 20pin connection and also a 4pin connector, look at this picture below so you know you have the power connections in the right places>>ba37bd3.jpg
On the top left of the picture, the big cream 20pin socket is where the 20 pin connector goes.
In the middle to the left you will see another cream 4pin socket is where the 4pin connector goes.
If your power supply does not have the 4pin connector the pc won't boot up, you will have to go out and buy one.
If you have all the connections right and the on/off button is connected to the front panel properly, take out the system memory, clean it with a clean, dry, soft pain brush and also clean the slots too, re-seat the memory and reboot the machine to see if it boots up.

Good luck and thanks for using Fixya!!!

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Power surge


You will need either a digital multimeter or a Power supply tester(recommended) for a couple of dollars on ebay the power supply tester is much easier than trying to test it yourself.

you can get one here

http://cgi.ebay.com/PC-20-24-Pin-PSU-ATX-SATA-HD-Power-Supply-Tester-Tool-B_W0QQitemZ300260901275QQcmdZViewItemQQptZPCA_UPS?hash=item300260901275&_trksid=p3286.c0.m14&_trkparms=72%3A1234|66%3A2|65%3A12|39%3A1|240%3A1318|301%3A1|293%3A1|294%3A50

This is a link to the tester that I own.

I would suggest a better method of surge protection. Go to radio shack and spend about 50-75 bucks on a good surge protector.

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