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Compaq 6715b will not start. pulled motherboard tested voltage on battery terminals, none. Figured MB was bad. Got a new one and same thing. What am I missing?? or are they all bad. this is the second new one doing the same thing as the original.

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Check the connections, the power supply. Is the cpu fan working? Is the power supply working?
Be sure the motherboard is not touching the case.

Posted on Oct 07, 2008

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Power suplly proably notgood engf to fire it up change oit

Posted on Oct 07, 2008

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My computer won't power on. Tested power supply by shorting green to black wire. Found PS fan seized. Replaced fan. Worked with pins shorted.

Admittedly, this could still be your power supply (PSU). Perhaps you did attach the 24 pin motherboard (MB) connection to a tester, but since the post does not specifically mention this I presume you may not have. Forgive me if that was done.

Assuming the test was only jumping the 24 pin connection verifying that fans kicked on; my guess would be that the PSU still functions. However, it may no longer be producing enough juice to power the PC.

If you have not done so already, I recommend testing the power supply against a tester to verify that you are getting enough voltage to power the motherboard.

Oct 24, 2015 | Dell Inspiron 531s Desktop Computer

1 Answer

Test a power supply

if your PSU starts (fan is spinning) you can test it with voltmeter. to check voltages for motherboard do next:
1. take PSU out of case
2. put power cable in
3. with some wire connect green and any black on MB connector on PSU (20/24 pins)
4. fan should start spinning
5. use voltmeter to check voltages

this is just basic. real PSU test is when you have device that will burden PSU while testing...

Nov 04, 2012 | Dell PC Desktops

1 Answer

I have a compaq Presario S4100NX that won't keep time. I have replaced the cmos battery, I flashed the bios to the latest version, I reset the bios to manually load default setup, but still no joy....

Does it loose time even with power cable connected? If so I would say your MB has a bad RTC chip and you need to replace the motherboard. Other things to check are make sure the CMOS battery your using is BRAND NEW with a good expiration date. That the contacts on the MB are making firm contact with the battery. Also check to make sure the contacts are CLEAN... no residue on them.

Sep 06, 2011 | HP Compaq Presario S4100NX PC Desktop

4 Answers

I have a Dimension 4700 that was working until recently.Now the computer won't boot at all. There is no power, the fans aren't whirring, no beeps and no video on the monitor. The only signs of power are a...

1a Research your blinking amber lights and the ABCD's. If the specifics don't explain a LACK of power (because even a shorted USB device can sap your juice resulting in a no video condition for example) try these:

Steps to get any PC running again:
1. Remove all addon cards and HD's CD's, so all you have is video, keyboard, and mouse.
Try it - if you see any video, add one thing back at a time starting with your boot and other drives. When it dies again, there's your problem...
2. Reseat the RAM and CPU
Try it, if it works you fixed it until oxygen does its thing again in a year or two...
3. Test power supply voltages with a meter, just test a hard drive connector, red and yellow are positive and the 2 blacks are grounds you should have both 12 volts and 5 volts, (plus a couple lower voltages for the CPU and RAM on the MB, disregard for now) if 5 and 12 are there, test that they have good amperage (over 1 amp will *usually* mean you have full power)
If it still doesn't work, it's either a power supply problem with the lower voltages, or a motherboard problem, retry steps 1 and 2 a couple times, then...
4. beg borrow or (eeek! buy) a power supply...

80 or 90 percent of the time, you won't get to step 3, let alone 4, all that's left is the motherboard, etc. good luck

Aug 09, 2010 | Dell Dimension 4700 PC Desktop

2 Answers

My T6216 Emachine stopped working. None of the

Even if those things power up doesn't mean your PSU is still good.
In particular the PSU in eMachines are known to be cheap/bad and one of the first things to go out.

If you have access to one try another ATX power supply.
You don't have to remove the old one just to test.

1) Unplug the existing PSU power cable from the back.
2) Remove all it's connections (MB, drives, etc).
3) Plug the other PSU in with just the two MB connections (the main, and 12v one), skipping any drives for now.
It's probably ok if the test one is not touching, but I like to put the PC on the side with the test PSU setting on top where the original one is making sure it has good contact with the case to make sure it's grounded.
4) Now plug the AC into the test PSU and power it up.

If it still dosn't power up it's probably MB, or CPU.
You could also unplug it again (you always want to unplug the PSU when doing anything, the power is always on), and try removing any add on cards (like your wireless card), and try again.

If it does power up (you get a POST screen), unplug PSU again, now plug-in drives, then AC back and see if it will boot up.

Jul 20, 2010 | E-Machines T6216 (827103077834) PC Desktop

1 Answer

Compaq presario sr1120nx will not post could this be the motherboard? i pulled out the memory modules and should have received beep codes for missing memory but none. Is this the motherboard?

yes if you have removed both sticks of ram and there is no beep code the n the motherboard is bad if you give me the serial i can give you the part number

May 13, 2010 | Compaq Presario SR1120NX 2.66GHZ Tower w/...

1 Answer

Asus M2N / Antec SP-350

Things to try:

1. Check that the cpu fan is properly connected to the correct port marked CPU FAN.

2. Make sure the power cables are connected correctly to the motherboard.

3. Test the button switch with a multi-tester to make sure that it tests good.

4. Make sure the power switch is connected to the correct pins on the motherboard.

5. With the computer off pop the cr2032 battery out and pop it back in after a few minutes.

6. Test the power supply with either another motherboard or a power supply tester.

7. Test the motherboard with another power supply.

8. If all else fails replace the motherboard I have had a bad one from time to time even out of the box, and if you have a spare cpu you may want to test with that also. Cpu's hardly ever go bad I think I have had two go bad ever, not counting power surges and storm damage.

Sep 10, 2009 | ASUS PC Desktops

4 Answers

My pc gets no power the flashing green light doesn't come on no fan nothing happens when i press the power button

best guess bad motherboard or bad power supply.

things to test:

1. Check that the power cord is plugged in snugly to the back of the computer and connected to a working power outlet or surge protector.

2. Check that the power cord is good. Replace if needed

3. Have the computers power supply checked. Replace if needed

4. Have the motherboard checked. Replace motherboard or get a new computer your choice.

Sep 09, 2009 | HP Compaq Presario SR2011WM PC Desktop

1 Answer


You may not be getting video and the fans running wide open if the Motherboard is bad, removing the battery will reset,the CMOS, which keeps time when turned off for one thing, If your video is intergrated into the MB, you are using system memory to display video, If so try removing the sticks (RAM) 1 at a time and see if that works, if your memory needs to run in pairs(DDR-DDR-2) forget trying one at a time, If you have a seperate video card, the card maybe bad. finally it may be your Powersupply, not supplying the correct voltage, but enough for fanspin. Last thing, you may have a bad CPU(Processor) or MB(Motherboard)

Apr 08, 2009 | eMachines T3604 PC Desktop

2 Answers

Emachine W2047 No BIOS Start Screen

You can test the power button. Remove the wires from the power on pins on the motherboard. Momentarily jump the two pins with a small screwdriver. If the computer starts the power button is bad. If it still doesn't start then something else is wrong. Did you test the memory? Also do all of the fans work, especially the CPU fan? It can't hurt to test with the other PSU. You know the HDD is good. Test one piece of hardware at a time and hopefully you will find the problem.

Jan 07, 2009 | E-Machines eMachines Desktop PC

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