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Windows 7: My PC will boot up but no signs of external power

23 Oct 2016   #11
Eric3742

Windows 7 x64
 
 

Then most probably is the monitor.

Is the monitor old type where the video cable is unable to remove.

This could means that either the MB connector not working or the monitor cable or monitor itself not working.

Funny thing is your keyboard also not working.


My System SpecsSystem Spec
.
23 Oct 2016   #12
logo897

windows xp, 7 home premium 64-bit, 10 on diff hard drives
 
 

Yes the monitor works perfectly fine on my other pc and I even tried connecting it to another one just in case. No luck. I just tried jumping the motherboard cmos battery and no such luck. Things look pretty bad right now...
My System SpecsSystem Spec
23 Oct 2016   #13
Megahertz07

Windows 7 HP
 
 

"Everything is ok except for some CPU bent pins, however they have been bent for over a month and my pc has worked flawlessly until yesterday" The bent pins are on the CPU or on the socket?

"There are some batteries that are tilted but none have come off." On a desktop there is only a Cmos battery (CR2032). Aren't them capacitors?

I still think the problem is with the CPU.
My System SpecsSystem Spec
.

23 Oct 2016   #14
logo897

windows xp, 7 home premium 64-bit, 10 on diff hard drives
 
 

Quote   Quote: Originally Posted by Megahertz07 View Post
"Everything is ok except for some CPU bent pins, however they have been bent for over a month and my pc has worked flawlessly until yesterday" The bent pins are on the CPU or on the socket?

"There are some batteries that are tilted but none have come off." On a desktop there is only a Cmos battery (CR2032). Aren't them capacitors?

I still think the problem is with the CPU.

My cpu pins are fine and only some pins by the power are bent, but not the power itself. Also yes, I meant capacitors not batteries, my mistake
My System SpecsSystem Spec
23 Oct 2016   #15
Megahertz07

Windows 7 HP
 
 

Didn't understand "My cpu pins are fine and only some pins by the power are bent, but not the power itself."
Can you be more clear? Are you talking about the MotherBoard or CPU?
My System SpecsSystem Spec
24 Oct 2016   #16
logo897

windows xp, 7 home premium 64-bit, 10 on diff hard drives
 
 

Quote   Quote: Originally Posted by Megahertz07 View Post
Didn't understand "My cpu pins are fine and only some pins by the power are bent, but not the power itself."
Can you be more clear? Are you talking about the MotherBoard or CPU?
My bad, I mean there are some pins by my power switch cable on my mobo that are bent, but I successfully installed the different colored wires on my PC mobo that enable me to turn on the pc with my power button. The pc turns on just fine as well as the power light, but the hard drive light does not flash or turn on whatsoever.
My System SpecsSystem Spec
24 Oct 2016   #17
Layback Bear

Windows 7 Pro. 64/SP-1
 
 

Could you fill in you (My System Specs) completely?
It would help us help you.
My System SpecsSystem Spec
25 Oct 2016   #18
Eric3742

Windows 7 x64
 
 

Seem that all else failed, there may be one thing not done /test yet.

Is your monitor connect to the computer using MB VGA or add-on VGA card on the PCI slot.
Three options:


1. If the monitor is connected directly to the MB (MB vga).
If possibly that the MB VGA connector is not working or the VGA itself failed.

1.1. Get a VGA card, from another computer if available, slot it in to the computer PCI slot.
Then connect the monitor cable to the VGA on PCI slot.


2. If your pc is connected directly to a VGA card on the MB PCI slot.

2.1. Turn off the pc and connection, open the MB and pull out the VGA card on the PCI slot.
Find a eraser and polish the gold contact and remove all bits of it. (Do not do it on top of the pc)
Slot back and connect to check.


3. The VGA connector is cable link to the MB pin.
Check the VGA connector, as the connector is do have loose or bend pin, contact no good.
(Remember this when reading about pin)

Both options 1 and 3 are the same, depend on the MB.



I did encountered this during when playing and repair (DIY) computer, during DOS to Windows period.
My System SpecsSystem Spec
25 Oct 2016   #19
Itaregid

Windows 10 Professional 64-bit
 
 

Quote   Quote: Originally Posted by fireberd
Intel says to reset the BIOS (CMOS memory) you must remove the battery for 15 minutes (usually 10 minutes is sufficient).
Oh? Do you have a link to the Intel document that says that?

I note the CMOS devices by their very nature "instantly" (within 1 or 2 clock cycles) dump their stored data when power is removed. That is why they are used in many applications and in particular, motherboards. The designers intentionally do not put "storage" capacitors in that circuit either (that's what the battery is for) so there is no need to wait for any caps to bleed off their charge. Even the 5 minutes the How-to Geek recommends is about 4 minutes 45 seconds longer than needed. This is also why shorting the two pins with the CMOS reset jumper only takes a second.

I note if motherboard designers wanted the CMOS data to be less volatile (harder to dump), they would not have used CMOS devices - but instead would have used EEPROMs or something similar.

@logo897 - have you been observing ESD precautions all this time? That is, have you been unplugging the computer from the wall (or flipping the PSU master switch) and touching bare metal of the case interior BEFORE reaching in to touch the CPU, RAM, graphics card etc.? This is essential to discharge any static in your body that may zap those ESD sensitive devices.

Quote:
I notice that when I remove all the RAM, the motherboard does beep, when when I put the RAM back in, it's silent again.
If you don't hear 1 short beep after putting the RAM back in, the system is NOT finishing POST (power on self-test).

According to the specs for that motherboard, it has integrated graphics. I think if me, I would pull the graphics card, and connect your monitor to the integrated graphics solution. Then pull all but one stick of RAM, and all drives. Verify all power connections are good, then boot. You should see the graphic and BIOS splash screens on the monitor. Then you should hear 1 short beep to indicate a successful POST. Then the system should halt with an error indicating no boot disk found. If that is not happening, then either your motherboard of the CPU is wrong.

Note I do agree with Eric3742 that motherboards should not die like that. However, that is under normal conditions. That is, you should be able to plug in and unplug USB devices and not short out your motherboard. But if the USB device, or one of the USB connectors is faulty, a +5V circuit could be crossed with another and potentially cause damage.
My System SpecsSystem Spec
25 Oct 2016   #20
Eric3742

Windows 7 x64
 
 

I do agree with @Itaregid that there should have 1 short beep upon starting.
As i forgot about this since i no longer use desktop computer

Also you need to remove your graphics card which may be the problem, as what @Itaregid mentioned.


When you are removing components such as RAM, and any other card, you need to check that all the gold contact is good.
And also the slot, such as the RAM slot, which can cause problem, if damaged or foreign bit is lock in the slot.
This happened to me while doing my friend /colleague computer, as i damage the RAM slot.

As since your keyboard do not light up, as it meant also another problem.

As mentioned by @Itaregid the USB connector, do check or i think you can disable that particular USB port.
Look at the wiring from the USB port inside the MB, to where the wiring end to which pins on the MB.

Also on the CMOS reset jumper only need Coin battery, that is no main power supply connected.

If @Itaregid say otherwise, then follow Itaregid advice.



(My memory is getting rusty on computers components, as this was a long time ago.)
My System SpecsSystem Spec
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 My PC will boot up but no signs of external power




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