Hi, I'm new to this forum because i get back from trash a very damaged Mac Pro 4,1 (2009). But because it's solid stuff, it's stille working. The case is damaged, but verything is working... except the 4 internal SATA ports (SATA in optical bay is working, also power for each 4 internal SATA ports). In page 29 in this guide, we can see a SATA/SAS Mux chip wich manage the 4 SATA ports, but the SATA in optical bay is using another way. So it seems that the issue come from this chip. Do you know what can i do / try to repair thoses SATA ports ? If it's not possible, i know i can use a SATA PCIe card, but i would prefer to use the internal ports. Thank you !