Red Light Flash

[3runjosh]

Hi, I was starting up my Mac Pro this evening in a dark room and noticed a flash of red light for half a second upon pressing the power button. Being curious of this I shut down the computer took off the side panel and tried powering it up again. I saw 4 lights on Memory Riser B flash on for half a second then disappear. In System Profiler it shows all my ram is 'OK' but I have never witnessed this flash of red light before. Is this a normal thing to occur when powering up a Mac Pro late 08 model or should I contact Apple over this?

 

[surflordca]

Hi, I was starting up my Mac Pro this evening in a dark room and noticed a flash of red light for half a second upon pressing the power button. Being curious of this I shut down the computer took off the side panel and tried powering it up again. I saw 4 lights on Memory Riser B flash on for half a second then disappear. In System Profiler it shows all my ram is 'OK' but I have never witnessed this flash of red light before. Is this a normal thing to occur when powering up a Mac Pro late 08 model or should I contact Apple over this?

I would think it is normal as mine does it also. I think it is just getting power before the computer reads the memory.

 

[djjclark]

They are hardware error indicators. They default on when power is applied and are turned off once the memory controller/memory is validated. It is normal to see them flash on power up.