(I did have some connected but removed them to try to isolate the source of the beep.)

The Mac Pro holds only one internal hard drive inside - a 2-terabyte drive I bought about a month ago which seems to be working fine and makes no other noises - and there are no other internal or external drives connected. I have used this machine for over 2 years and have never heard this sound until two days ago. It's a single clear beep, kind of like what an old PC would make when starting up. Note: this isn't the beep-ish sound ('bzzzzzeeeeeeeessssshhhhhhh') that occurs when a disk drive starts grinding into itself. It's definitely not coming through the external speakers. And then nothing else for another hour or so.Įach of the three is a single high-pitched beep, and it seems to emanate from the chassis. And then about a minute later, a second beep. There is also CS-FLUX which seems to be flux specially designed for BGA rework by a laptop repair workshop.Every hour or so - it seems random - a beep comes out of the chassis of my Mac Pro (desktop tower). Amtech flux is very good for this job but quite expensive (on ebay most Amtech flux that is offered for under 25$ from China is low quality Chinese copy). If you intent to do just a reflow you will definitelly need apropriate flux to be injected under the GPU. A reflow (heating of the solder balls under the GPU at around 250 degrees) could fix the problem temporary but in order to have a permanent result you need to remove the GPU and replace the solder balls (reballing).

Apple macbook pro 3 beeps