On every reboot, Flo Beta1 kudzu finds two unknown devices and then removes
them.
Disabling the USB function in the motherboard stopped the symptoms.

    MOBO = Asus A7V Socket A
    CPU =    AMD Duron 700

This section in  /etc/sysconfig/hwconf kept changing:
-
class: UNSPEC
bus: USB
detached: 0
device: none
driver: none
desc: "unknown"
-
This section did not change:
-
class: USB
bus: PCI
detached: 0
driver: usb-uhci
desc: "VIA Technologies|VT82C586B USB"
vendorId: 1106
deviceId: 3038
subVendorId: 0925
subDeviceId: 1234
pciType: 1
-

RH7.0 lspci -v shows the USB controlers.

00:04.2 USB Controller: VIA Technologies, Inc. VT82C586B USB (rev 10)
(prog-if 00 [UHCI])
        Subsystem: Unknown device 0925:1234
        Flags: bus master, medium devsel, latency 32, IRQ 15
        I/O ports at d400
        Capabilities: [80] Power Management version 2

00:04.3 USB Controller: VIA Technologies, Inc. VT82C586B USB (rev 10)
(prog-if 00 [UHCI])
        Subsystem: Unknown device 0925:1234
        Flags: bus master, medium devsel, latency 32, IRQ 15
        I/O ports at d000
        Capabilities: [80] Power Management version 2