I'm not sure whether this is a problem with the monitor, the graphics card, or (most likely) the graphics drivers.
I have a Sapphire ATI Radeon HD 5870, which has two DVI outputs. The drivers for these are up-to-date (I downloaded the 10.9 drivers from here). On the DVI outputs I have two identical Iiyama ProLite E2407HDS 24" monitors (both connected with DVI cables) - these did not require drivers, just plug & play.
The primary monitor works fine. Sometimes, however, the secondary monitor is not detected when I start up the PC. It also is sometimes not detected when I wake the PC from sleep. Sometimes a restart activates the second monitor, sometimes not. Occasionally it is re-detected whilst I am in the midst of using the PC (the primary monitor blinks off for a second, then comes on again, and the second monitor suddenly comes on - as though the display driver is restarting or similar).
Swapping the physical monitors makes no difference, therefore I'm sure it is not a monitor problem. Swapping around the cables makes no difference either. Swapping which DVI output the primary monitor is plugged into also makes no difference (it still works and still is the primary monitor, and the secondary monitor still is not detected).
I think this only leaves the display driver as the cause of this fault. Has anyone come across this issue before, or how best to go about solving it?
Other PC details, not sure if relevant:
Processor: Intel Core i7-930
Motherboard: Gigabyte GA-X58A-UD
Primary HDD: 2x 64GB Crucial SSD (in RAID0)
Secondary HDD: 2x 500GB Seagate Barracuda 7200 (in RAID0)
Memory: 6GB Crucial DDR3 PC3-10600
OS: Windows 7 64-bit, always updated.
I have a Sapphire ATI Radeon HD 5870, which has two DVI outputs. The drivers for these are up-to-date (I downloaded the 10.9 drivers from here). On the DVI outputs I have two identical Iiyama ProLite E2407HDS 24" monitors (both connected with DVI cables) - these did not require drivers, just plug & play.
The primary monitor works fine. Sometimes, however, the secondary monitor is not detected when I start up the PC. It also is sometimes not detected when I wake the PC from sleep. Sometimes a restart activates the second monitor, sometimes not. Occasionally it is re-detected whilst I am in the midst of using the PC (the primary monitor blinks off for a second, then comes on again, and the second monitor suddenly comes on - as though the display driver is restarting or similar).
Swapping the physical monitors makes no difference, therefore I'm sure it is not a monitor problem. Swapping around the cables makes no difference either. Swapping which DVI output the primary monitor is plugged into also makes no difference (it still works and still is the primary monitor, and the secondary monitor still is not detected).
I think this only leaves the display driver as the cause of this fault. Has anyone come across this issue before, or how best to go about solving it?
Other PC details, not sure if relevant:
Processor: Intel Core i7-930
Motherboard: Gigabyte GA-X58A-UD
Primary HDD: 2x 64GB Crucial SSD (in RAID0)
Secondary HDD: 2x 500GB Seagate Barracuda 7200 (in RAID0)
Memory: 6GB Crucial DDR3 PC3-10600
OS: Windows 7 64-bit, always updated.