Where are the LEDs on a Mac Pro?
The Mac Pro (Early 2008) logic board includes a set of LEDs to help service providers troubleshoot the computer. The LEDs are located on the logic board between the two DIMM riser card connectors. LEDs 3, 4, 5, and 6 are normally off and will automatically illuminate if an error occurs.
Why is my MacBook Pro power on but no video?
Overheated memory could be a possible cause for this CPU error LED to come on. Check fan operation. Unplug the AC cord and remove the battery for 10 seconds. You may need to remove a PCI Express card to get to the battery. Reinstall the battery and restart the computer. Try swapping CPU A and CPU B locations.
How can I get my Mac Pro to turn on?
I bought a couple of new hard drives and a couple of new (MSI F5450 MDIGH) video cards, installed one of each into each of the two Xeon machines, and pressed the button. Both machines turn on and the power lights are on steady.
Why does my MacBook Pro flash when no RAM is installed?
If the test detects a problem, the status LED located above the power button on the front of the computer will flash in the following ways*: 1 Flash: No RAM is installed or detected. Or, the quick memory test failed. An LED will light up on the memory riser card next to the affected DIMM or empty DIMM slot.
Where is the diagnostic light on a MacBook Pro?
After putting the PCI card back in the 2nd time the machine would not boot but only power on for less than a second then shut down (relay click heard), with a solid red LED diagnostic light at the upper LH corner of the backplane board near the front of the case labelled OVTEMP CPUA (the top most of 4 lights) that remains on.
What’s the green light on my MacBook Pro?
If I press the button labelled DIAG LED just below it I get a green light at the bottom of the same 4 LED’s marked 5V STBY. The machine was running fine only minutes before in both OS’s when finishing up my OS install. Am wondering if I bumped or caused something while working only in the PCIe area.