I transferred my old PC to new a case but nothing on the screen!

Hi,

I transferred my old PC, which I didn't use for a long time and has a dead PSU, into a new case (TX Sonic 460W Midi Tower).

After finishing the job, I pressed the power button. Everything seems to work nicely, CPU's and GPU's fan are working but there is nothing on the monitor, however "No signal" warning doesn't appear too, just black!

My power supply has PCI-e cable and my GPU is AGP but it seems to work perfectly without any power connector. Later I used 2x4 power connector of my old case, but this time PC didn't start!

So where is the problem? Any ideas?

PS I didn't use the ATX 12 V connector also. When I plug it in, nothing works again!

MOBO: 775Dual-VSTA (http://www.asrock.com/mb/VIA/775Dual-VSTA/)
GPU: ATI HD 3850 AGP
CPU: Pentium D 2.80 800 mhz
7 answers Last reply
More about transferred case screen
  1. Your graphics card needs a 6 pin pci-e power connector to work.

    Also, there is a 4 pin cpu power connector that usually needs to be filled.

    You may need an adapter such as this:
    http://www.newegg.com/Product/Product.aspx?Item=N82E16812296209
  2. geofelt said:
    Your graphics card needs a 6 pin pci-e power connector to work.

    Also, there is a 4 pin cpu power connector that usually needs to be filled.

    You may need an adapter such as this:
    http://www.newegg.com/Product/Product.aspx?Item=N82E16812296209


    My GPU has 8 pin, so why do I need 6 pin?
  3. f451 said:
    My GPU has 8 pin, so why do I need 6 pin?


    OOPS! you are right, it is 6 pin. A really old and inefficient card.

    I suspect that the problem may lie in the direction of your psu.
    Excepting antec, cases with included psu's are mostly junk and do not deliver advertised power.

    A graphics card that needs an 8 pin connector will draw up to 150w from the connector, plus up to 75w from the slot.
    Probably too much for a poor quality 460w psu.

    On the side of your psu will be a data plate. How many watts or amps does it list for the +12v rail/s?
  4. It says:

    +12V1: 14A
    +12V2: 16A
  5. f451 said:
    It says:

    +12V1: 14A
    +12V2: 16A


    The total amperage is not usually the sum of all the rails.
    Is there something that says how many total watts or amps for the combined rails?

    Regardless, it looks insufficient. A quality modern psu like the Antec 450w
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817371054

    will have a data plate indicating 403w(403/12=34a) for the combined rails.
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817371054
  6. I'm not sure this is the right one but last line says MAX: 155W and below it, 384W. And also says continous power 400w and peak p. 460w
  7. I am deeply suspicious of your psu. It is the one component of import that you changed.
    What was your old psu that failed?

    Regardless, here is a quality replacement, the PC P&C silencer Silencer MK III 500W for $59 after rebate:
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817703035
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