helmutfromlaval quebec
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Q: hi i have a powertowerpro 225  built in1996 its been in storage for 12 yrs was working fine  then  it boots up but no image on screen  help  thank u

Its a Mac clone that was sold 4 to 2 yrs  I have 2of them and both have the same problem  can't get them on the screen  and any help would b nice  thank u.

Posted on Feb 28, 2015 4:54 PM

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helmutfromlaval quebec

Q: hi i have a powertowerpro 225  built in1996 its been in storage for 12 yrs was working fine  then  it boots up but ... more

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  • by Jan Hedlund,

    Jan Hedlund Jan Hedlund Feb 28, 2015 5:22 PM in response to helmutfromlaval quebec
    Level 6 (9,901 points)
    Feb 28, 2015 5:22 PM in response to helmutfromlaval quebec

    Some Macintosh computers had difficulties with the video circuits if the internal battery voltage was too low. I do not know whether this could be the case with the Power Computing machines as well, but you may want to check the batteries anyway to begin with.

     

    Jan

  • by helmutfromlaval quebec,

    helmutfromlaval quebec helmutfromlaval quebec Feb 28, 2015 5:28 PM in response to Jan Hedlund
    Level 1 (0 points)
    Feb 28, 2015 5:28 PM in response to Jan Hedlund

    Hi  there's only one battery and I changed it    also pressed the cuda reset    battery is 3.6 volts   any other ideas ?  Thank u

  • by Jeff,

    Jeff Jeff Feb 28, 2015 11:20 PM in response to helmutfromlaval quebec
    Level 6 (11,559 points)
    Feb 28, 2015 11:20 PM in response to helmutfromlaval quebec

    Your PowerTower Pro 225 shares the same architecture as the Power Mac 9600/200 & 233 MHz models, although your model's chassis has more expansion bays.  Assuming that the OEM PCI graphics card hasn't been replaced, it's an ims (later "ixMicro") TwinTurbo with 8 MBs of VRAM.  Over time and especially when sitting in storage, the gold-plated pins on the edge of the processor, memory, and PCI cards can become oxidized and cause problems.  Remove the cards and gently clean both sides of the pins with a soft white eraser.  Be sure to blow off any residual rubber shavings before re-installing them.  Now, if someone has replaced the original PCI graphics card with one from a PC, it won't function in a Mac or Mac clone.  The card's ROM must be programmed with Mac code in order to function.

  • by helmutfromlaval quebec,

    helmutfromlaval quebec helmutfromlaval quebec Mar 1, 2015 4:18 PM in response to Jeff
    Level 1 (0 points)
    Mar 1, 2015 4:18 PM in response to Jeff

    Hi  I took out the 2 boards and cleaned them but no luck     sorry didn't mention I don't get the apple chime at start up either   would it help if changed the slots for the boards ?

  • by kahjot,

    kahjot kahjot Mar 4, 2015 1:08 PM in response to helmutfromlaval quebec
    Level 4 (1,387 points)
    Desktops
    Mar 4, 2015 1:08 PM in response to helmutfromlaval quebec

    What kind of monitor are you using?

  • by helmutfromlaval quebec,

    helmutfromlaval quebec helmutfromlaval quebec Mar 4, 2015 2:34 PM in response to kahjot
    Level 1 (0 points)
    Mar 4, 2015 2:34 PM in response to kahjot

    Hi     its a 14 in  Mac screen...  My box has both connections  why   do u think  that's a problem ?

  • by kahjot,

    kahjot kahjot Mar 5, 2015 9:26 PM in response to helmutfromlaval quebec
    Level 4 (1,387 points)
    Desktops
    Mar 5, 2015 9:26 PM in response to helmutfromlaval quebec

    Just curious. It took some fiddling to get a flat panel widescreen monitor working with my 9600. That doesn't seem to be relevant t your situation, though.

  • by helmutfromlaval quebec,

    helmutfromlaval quebec helmutfromlaval quebec Mar 6, 2015 8:21 AM in response to kahjot
    Level 1 (0 points)
    Mar 6, 2015 8:21 AM in response to kahjot

    Hi sorry was a bit frustrated and stopped playing with it can't get the screen up and running so can't change any settings and still no chime on start up so  I don't know if pram is reset or not

  • by helmutfromlaval quebec,

    helmutfromlaval quebec helmutfromlaval quebec Mar 6, 2015 8:27 AM in response to Jan Hedlund
    Level 1 (0 points)
    Mar 6, 2015 8:27 AM in response to Jan Hedlund

    Hi  i changed the battery again  but no luck    still no chime  on start up or when I tried to reset pram

  • by helmutfromlaval quebec,

    helmutfromlaval quebec helmutfromlaval quebec Mar 6, 2015 8:36 AM in response to Jeff
    Level 1 (0 points)
    Mar 6, 2015 8:36 AM in response to Jeff

    Hi I haven't changed any cards while in my possession my video card has both connections so I bought an old Mac screen 14 in    trying 2 locate an adaptor to plug in the other small connector ?? Is there something I have 2 do 2 switch screen selection

  • by Jan Hedlund,

    Jan Hedlund Jan Hedlund Mar 6, 2015 11:15 AM in response to helmutfromlaval quebec
    Level 6 (9,901 points)
    Mar 6, 2015 11:15 AM in response to helmutfromlaval quebec

    Helmut,

     

    What happens if you connect headphones or external speakers? Can the startup sound be heard then? Otherwise, there could be a problem on the logic board (this may be merely audio-related, or something more fundamental).

     

    Even if a startup sound cannot be heard, nor anything seen on the screen, does the hard drive appear to be active (clicking, as during a normal startup sequence) after the computer has been turned on?

     

    Have you tried using a magnifying glass to inspect the video and logic boards inside the computer (looking for leaking/bulging/discoloured/cracked electronic components)? Leaking electrolytic capacitors can be the cause of various problems.

     

    You indicated that it is a 14" Mac monitor. Normally, that would mean a DB-15 plug (with 15 pins in two rows). Under your Older Hardware topic (https://discussions.apple.com/thread/6856695), you mentioned that the plug only had 10 of 15 pins. It is not possible to say whether or not the ten pins are sufficient without knowing their exact positions. Please note that special sense codes were used in order to tell Macintosh computers the type of monitor connected (you may want to search for "Sense Lines" at https://developer.apple.com/legacy/library/navigation/ for further information).

     

    Could you borrow an older (CRT) PC monitor with a VGA plug (HD-15/DE-15, with 15 pins in three rows) just for a test?

     

    Jan

  • by helmutfromlaval quebec,

    helmutfromlaval quebec helmutfromlaval quebec Mar 6, 2015 12:33 PM in response to Jan Hedlund
    Level 1 (0 points)
    Mar 6, 2015 12:33 PM in response to Jan Hedlund

    Hi  plunged in head phones no luck   cked all the boards and cleaned them   they seem ok.   Did a pin ck the ones that r missing  r dead one's.   tried my PC screen view sonic v a 2026w  no luck

  • by helmutfromlaval quebec,

    helmutfromlaval quebec helmutfromlaval quebec Mar 6, 2015 12:39 PM in response to Jan Hedlund
    Level 1 (0 points)
    Mar 6, 2015 12:39 PM in response to Jan Hedlund

    Oh 4got.    Hard drive seems 2 start ok I hear it clicking normally

  • by helmutfromlaval quebec,

    helmutfromlaval quebec helmutfromlaval quebec Mar 9, 2015 2:20 PM in response to Jan Hedlund
    Level 1 (0 points)
    Mar 9, 2015 2:20 PM in response to Jan Hedlund

    Hi  just a thought     I just remembered   I have an old 7200 Mac  could I hook up the hard drive there and use that as the home  ??  Thanks

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