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15 sec intervel beeping coming from PC tower, #1 green light occaisionally lights up on key board, screen not opening up

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There's a high probability that it is caused by a loose cable. Certain graphics cards require extra power, so there's a power cable connected to it. If that cable is disconnected and the computer started, the card makes a loud beeping noise to alert you to fix it. Consequently insufficiently powered graphics card is unable to display any image.

How to investigate this?
1. Open up the computer (assuming you have the skills and courage to do so)
2. Try to find the graphics card (it could look something like this:
3. Look for the corner of the card. The cable should go somewhere here. Here's an example image:
4. Look for a compatible cable somewhere inside the computer. BTW the cable might already be at the right place, but just not tight enough, so if it's already where it's supposed to, give it a little push to see if it goes just a bit deeper.

Posted on Oct 22, 2013

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  • Carol Saltzman
    Carol Saltzman Oct 23, 2013

    the screen just says 'acer explore beyond limits'. every 20 sec a command on bottum left corner says Press BIOS Set up. the key board no longer flashes green but i am not able to open the computer regardless of how courageous i am!!

  • Fulgurite Fractal
    Fulgurite Fractal Oct 23, 2013

    Thanks for the extra info.

  • Fulgurite Fractal
    Fulgurite Fractal Oct 23, 2013

    Since there's some text about BIOS, it's good sign, since apprently the screen is cooperating with the rest of the hardware. In any case, I suppose I should have been more precise regarding the "opening" part. What I meant was that you should physically open the metal box with a screwdriver (if necesary) and take a look at the cable spaghetti mess inside it.



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rey jr
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SOURCE: My PC stop working , beep and not load anything ,

hi there, check up for some loose connection. a memory card, a vide card and some power supply connectors. ty

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SOURCE: HP Media Center Power Up Problem

replace the power supply-from a computer store, should be no more than 30 dollars

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SOURCE: Dimension 8400 will not boot and more.......

I would recommend testing the power supply as Dell PS's are not known to be "forever". A power supply tester can be purchased online at for around $20 and they are fairly easy to use (you can also get a new PS there if necessary). If that is not it, I recommend going to a local small computer shop and picking up a used Hard Drive (be sure to get SATA), and switch it for your main HDD,, if the PC starts up and goes to an "Error no OS found" or the ilk, the culprit is your hard drive. I am in CT and fix PC's for a living, I am A+ certified and have passed all the dell Factory Cert tests. If you need help and are in the area or work well over the phone,, let me know I CAN solve this problem.


Posted on Aug 04, 2009

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SOURCE: 4 long beeps, then 2 - 2 yellow lights, 2 green...

try replacing the keyboard,

Posted on Jan 11, 2010

  • 4234 Answers


The power supply generates 3 different voltages for the system. The most common cause of the symptom you are describing is a loss of the 5V supply line. This is an internal failure of the power supply that sometimes can be easily fixed, but the cost of repair is likelt to be higher than a replacement supply. A typical power supply will cost around $40. If you have another system around, swap the power supplies between the two. If the system now appears to work, you have confirmed the problem.


Posted on May 10, 2010

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