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Apple Computing Products:
macOS - Desktop Hardware
Mac Pro Not Booting .....
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<blockquote data-quote="techiesteve" data-source="post: 1549916" data-attributes="member: 98520"><p>There's possibility that using a tooth brush on the backplane board or the processor tray could have, depending upon how much force was used, damaged an SMD component. Other possibilities are static damage. I'll sometimes use a 'tooth brush', but mine is a black antistatic brush, with isopropyl alcohol, to clean up a pcb after a liquid spillage in the hope of recovering the part, but I also use an earthed static dissipative matt and wrist band.</p><p></p><p>Here's one basic test to try.</p><p></p><p>When connecting the Mac Pro to AC power, verify that the LEDs for OVTMP CPUA and OVTMP CPUB briefly flash red (less than 0.5 sec). The LEDs are located under hard drive bay 1 on the backplane board. If they do not illuminate briefly, there is an issue with either the power supply or the backplane board. </p><p></p><p>Let us know how what result you get, then we can move on.</p></blockquote><p></p>
[QUOTE="techiesteve, post: 1549916, member: 98520"] There's possibility that using a tooth brush on the backplane board or the processor tray could have, depending upon how much force was used, damaged an SMD component. Other possibilities are static damage. I'll sometimes use a 'tooth brush', but mine is a black antistatic brush, with isopropyl alcohol, to clean up a pcb after a liquid spillage in the hope of recovering the part, but I also use an earthed static dissipative matt and wrist band. Here's one basic test to try. When connecting the Mac Pro to AC power, verify that the LEDs for OVTMP CPUA and OVTMP CPUB briefly flash red (less than 0.5 sec). The LEDs are located under hard drive bay 1 on the backplane board. If they do not illuminate briefly, there is an issue with either the power supply or the backplane board. Let us know how what result you get, then we can move on. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
Mac Pro Not Booting .....
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