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Question: Mac Pro mid 2010 no boot no chime no keyboard light power issue

hi

my Mac Pro mid 2010 does not Boot

it has no chime, no power to turn in the led caps lock light on the keyboard but the mouse led turns On and when I plug in my external hard drive the led lights on the hard drive come On. The white led light next to the power button on the Mac is always solid white when on (Even if I take out any parts of the Mac eg ram, hard drive, graphics card).

i have checked the graphics card on my pc and it works perfectly, the ram i has swapped with my pcs ram ddr3 which I know works. The hard drives have OS X leopard from Installed My power Mac g5 and so it works. I changed the battery but nothing helped. i have done smc and pram resets. But no display is occurring, I know the display works, I used dvi , mini display port, vga i also plugged in a graphics card from my pc to The Mac but did not help (I don’t know if they are supposed to be compatible or if any old graphics card works in the mac). I have tried several hard drives. Also when I boot with no ram the led diagnotic lights don’t come up next to the ram slots. Only when I turn on the computer does a red light flash on the processor board And 2 lights on the backpane board. Fans run and the optical dvd drive makes sound but cannot be controlled via keyboard. I know the keyboard, mouse works.

What should I do next?

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Mar 18, 2018 7:40 AM in response to gfegeg4235 In response to gfegeg4235

The "approved method" for debugging difficult startup problems like this one is to remove everything that is in a slot and look for the chime or the blinking power-on light. Remove all drives, all PCIe cards, all RAM.


Perform an SMC reset by removing AC power card and pushing the power-on button for a quarter minute to drain all the stored energy from the Power capacitors in the power supply. then restore AC power cord, allow it to settle for a few seconds, then attempt to power on.

Mar 18, 2018 7:40 AM

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Mar 18, 2018 12:29 PM in response to gfegeg4235 In response to gfegeg4235

Power-on light blinking in groups of three means, "not enough working RAM to start up". If you get that, then fixing the RAM should allow you to get the chime. Then you can build back up from there.


About Mac startup tones - Apple Support

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Mar 18, 2018 12:29 PM

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Mar 18, 2018 2:55 PM in response to gfegeg4235 In response to gfegeg4235

a) if you get the CHIME, it is working correctly


b) if you do not get the CHIME, you still have problems.


One possibility is that you set the Volume low, the chime was there, but you cannot hear it. If that is the case, put the graphics card back in and hold Alt/Option at Startup. You should get a gray or blue screen with an Icon for every bootable drive (none). This code is all in ROM. No drives are needed.

Mar 18, 2018 2:55 PM

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Mar 19, 2018 6:27 AM in response to gfegeg4235 In response to gfegeg4235

power off, slide out the processor shelf. Do not disassemble anything.


Do a quick check to see if the Northbridge chip heatsink, described and pictured in this article, is wiggly to your touch. If it is solid, this is not the problem.


http://www.xlr8yourmac.com/archives/jul14/071114.html

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Mar 19, 2018 6:27 AM

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Question: Mac Pro mid 2010 no boot no chime no keyboard light power issue