Speccy only shows the MB having 4 PCI slots.
QUOTE 
Motherboard
	Manufacturer	Gigabyte Technology Co., Ltd.
	Model	G31M-ES2L (Socket 775)
	Chipset Vendor	Intel
	Chipset Model	P35/G33/G31
	Chipset Revision	10
	Southbridge Vendor	Intel
	Southbridge Model	82801GB (ICH7/R)
	Southbridge Revision	A1
	System Temperature	30 °C
		BIOS
			Brand	Award Software International, Inc.
			Version	FF
			Date	13/10/2009
		Voltage
			CPU CORE	1.088 V
			MEMORY CONTROLLER	1.888 V
			+3.3V	3.312 V
			+5V	4.946 V
			+12V	0.832 V
			+5V HIGH THRESHOLD	5.107 V
			CMOS BATTERY	3.264 V
		PCI Data
				Slot PCI
					Slot Type	PCI
					Slot Usage	Available
					Bus Width	32 bit
					Slot Designation	PCI
					Characteristics	5V, 3.3V, PME, SMBus
					Slot Number	0
				Slot PCI
					Slot Type	PCI
					Slot Usage	Available
					Bus Width	32 bit
					Slot Designation	PCI
					Characteristics	5V, 3.3V, PME, SMBus
					Slot Number	1
				Slot PCI
					Slot Type	PCI
					Slot Usage	Available
					Bus Width	32 bit
					Slot Designation	PCI
					Characteristics	5V, 3.3V, PME, SMBus
					Slot Number	2
				Slot PCI
					Slot Type	PCI
					Slot Usage	Available
					Bus Width	32 bit
					Slot Designation	PCI
					Characteristics	5V, 3.3V, PME, SMBus
					Slot Number	3
So I looked up the MB and found it has 2 Express slots & 2 ordinary ones.
QUOTE 
1 x PCI Express x16 slot
1 x PCI Express x1 slot
2 x PCI slots
http://www.gigabyte.com.au/products/produc...spx?pid=3485#spI've been through the resolution hoops & a fair bit of 'Chrome' tweaking, strangely it doesn't happen in Firefox but it could be how the different browsers render the websites.
Got to the stage where it has to be a hardware problem because I've ruled everything else out.
(I hope LOL)