No Display No Beep

Hi im having a computer that doesn't display anything or when it starts doesn't beep. I've changed the cpu, ram, graphic card and until now nothing.
Any suggestions?
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More about display beep
  1. Hi newcomer and welcome to the Tom's hardware forum.

    Do u check the cables and the monitor?
  2. Do the fans spin up?

    Do the HDD's start?

    What's your PSU?
  3. we need more info, system specs are the most important as well as what you have tried so far.

    you need to try reseating the ram as well as making sure all you PSU wires are connected correctly.

    did it ever work? are any components new? resetting the BIOS could help form an OC failure but without knowing what you have odne it will take forever to gues the problem.
  4. Hi and thank you yes i've checked everything the fans spin and the cables are ok hdd is working good. Should i change power supply?
  5. What components do u have? CPU, RAM, mobo, GPU and PSU.
  6. System specifications?

    Our standard checklist and troubleshooting thread:
    http://www.tomshardware.com/forum/261145-31-read-posting-boot-problems

    To do a basic check out of the PSU:
    Try to borrow a known good PSU. (Brand new, out of the box, untested PSU is not a known good one.) If you cannot do that, borrow a DMM to measure the voltages. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

    The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

    You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.

    http://www.youtube.com/watch?v=5FWXgQSokF4&feature=youtube_gdata

    This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.
  7. Ok thank you very much guys i will try all this and i will see if it works.
  8. saint19 said:
    What components do u have? CPU, RAM, mobo, GPU and PSU.


    I have CPU, RAM, PSU, HDD
  9. ^Yeah Iknow that, i mean what specific components.

    All the specifications of ur rig.
  10. saint19 said:
    ^Yeah Iknow that, i mean what specific components.

    All the specifications of ur rig.

    lol. you want also motherboard model/type? ram? and everything else?
  11. ^Yeah, that was my 1st question.
  12. Also do you have a speaker on the motherboard? It's the easiest way to diagnose a lot of problems when booting up.

    If you dont have one, buy it, they're very cheap.


    Looks like this: http://cdn3.ioffer.com/img/item/884/277/21/cd41_1.JPG

    Might be mounted on the motherboard itself, without wires.
  13. saint19 said:
    ^Yeah, that was my 1st question.

    Well this computer wasn't mine it was my friend computer but know he bought a new one, so he asked if i want it and i told him yes. Is a pentium 4 3.00ghz, 1gb ram DDR, Geforce 6200 256mb DDR. i don't remember righ now the model/type of the motherboard but i'll find it later.
  14. flaminggerbil said:
    Also do you have a speaker on the motherboard? It's the easiest way to diagnose a lot of problems when booting up.

    If you dont have one, buy it, they're very cheap.


    Looks like this: http://cdn3.ioffer.com/img/item/884/277/21/cd41_1.JPG

    Might be mounted on the motherboard itself, without wires.

    There is a speaker on the motherboard
  15. Well if the pc lights up but no beep or sound or anything I would guess that the atx power supply may not be connectedto the board or it may be faulty. Remember there are 2 power cables that connect to the motherboard one on the outer edge of the board and one small one somewhere close to the cpu. Make sure they are both connected.
  16. Ok guys i found the problem what it is. I've changed the power supply and now it works great! Thank you
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