Aaeon SBC-551 Manual page 21

Warning! Always completely disconnect the power cord from
your chassis whenever you are working on it. Do
not make connections while the power is on
because sensitive electronic components can be
damaged by the sudden rush of power. Only
experienced electronics personnel should open
the PC chassis.
Caution! Always ground yourself to remove any static
charge before touching the CPU card. Modern
electronic devices are very sensitive to static
electric charges. Use a grounding wrist strap at all
times. Place all electronic components on a
static-dissipative surface or in a static-shielded
bag when they are not in the chassis.
Conflicts! The VGA controller of SBC-551/552 uses IDSEL
No. 31, which is the same as that of the first PCI
slot (i.e., "PCI1") on the PCI backplane (PICMG
2.0 standard). Therefore, when the onboard VGA
function is enabled, the first PCI slot on the PCI
backplane cannot have a peripheral card plugged
in otherwise hardware conflicts can result.
Chapter 2 Installation 13