Mac Pro A1115

Ladies and gents, I have seen this problem in a gazillion Internet discussions but none of the advices given there would help, so here I am turning to you for advice.

I have an A1115 Mac Pro that had been shelved two years prior in a good working condition.

Mac Pro (Early 2008) - Technical Specifications

My config:

2x quad-core 2.8 GHz Xeons - tested, good
8x1 GB 800 MHz RDRAM - tested, good
ATI Radeon HD 2600 XT with 256MB in slot 1 x16 - tested, good
500GB SATA in slot 1 - tested, good

No chime, no power in USB connectors, fan on the VGA runs, case fan runs, no LEDs on riser board

USB keyboard got no power, Caps Lock LED doesn't light up

Screen is blank (Apple Cinema 20", also tested, good)

HDD spins up

New CR2032 battery

Mac doesn't react to any key combinations.

I replaced literally EVERY component to no avail during my tests to other known good components.

Also tried to boot with no RAM, no HDD, no peripherals, no USB, same outcome.

I am at a loss. Does it mean that my mainboard is defect? Aiuto! Ajoutez! Hilfe!

Mac Pro

Posted on Nov 23, 2022 8:14 AM

Top-ranking reply

Grant Bennet-Alder

Level 10

140,867 points

Posted on Dec 13, 2022 9:01 AM

The initial "chime" sound is generated in software when your Mac passes the Power-On Self Test. If the chime occurs and/or startup continues, your Mac is working. The blank gray screen should light up. Then on to the disk Drive.

Absent a chime, either the main processor did not get started, or a fatal error occurred so early on in the process, that no indications could be sent. A few of these will be reflected as blinking power indicator lights, with a repeating pattern.

With NO RAM DIMMS installed, a running processor should blink out the small integer number of blinks indicating "no working RAM installed".

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Mac Pro A1115

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