[micr0]

Well, here's what my dev folder contains.

dr-xr-xr-x 6 root wheel 512 Sep 16 15:53 .
drwxr-xr-x 19 root wheel 512 Sep 16 15:53 ..
crw-r--r-- 1 root wheel 0, 29 Sep 16 15:53 acpi
crw-r----- 1 root operator 0, 58 Sep 16 15:53 ad4
crw-r----- 1 root operator 0, 59 Sep 16 15:53 ad4p1
crw-rw-r-- 1 root operator 0, 55 Sep 16 15:53 apm0
crw------- 1 root operator 0, 28 Sep 16 15:53 ata
crw------- 1 root wheel 0, 43 Sep 16 15:53 atkbd0
crw------- 1 root wheel 0, 10 Sep 16 15:53 console
crw-rw-rw- 1 root wheel 0, 49 Sep 16 15:53 crypto
crw-rw-rw- 1 root wheel 0, 11 Sep 16 15:53 ctty
crw-rw---- 1 66 68 0, 40 Sep 16 15:53 cuad0
crw-rw---- 1 66 68 0, 41 Sep 16 15:53 cuad0.init
crw-rw---- 1 66 68 0, 42 Sep 16 15:53 cuad0.lock
crw-r----- 1 root operator 0, 64 Sep 16 15:53 da0
crw-r----- 1 root operator 0, 65 Sep 16 15:53 da0a
crw-r----- 1 root operator 0, 66 Sep 16 15:53 da0c
crw------- 1 root wheel 0, 5 Sep 16 15:53 devctl
cr-------- 1 root wheel 0, 52 Sep 16 15:53 devstat
dr-xr-xr-x 2 root wheel 512 Sep 16 15:53 fd
crw------- 1 root wheel 0, 16 Sep 16 15:53 fido
crw-r----- 1 root operator 0, 4 Sep 16 15:53 geom.ctl
crw------- 1 root wheel 0, 17 Sep 16 15:53 io
lrwxr-xr-x 1 root wheel 6 Sep 16 15:53 kbd0 -> atkbd0
lrwxr-xr-x 1 root wheel 7 Sep 16 15:53 kbd1 -> kbdmux0
lrwxr-xr-x 1 root wheel 5 Sep 16 15:53 kbd2 -> ukbd0
crw------- 1 root wheel 0, 24 Sep 16 15:53 kbdmux0
crw------- 1 root wheel 0, 8 Sep 16 15:53 klog
crw-r----- 1 root kmem 0, 27 Sep 16 15:53 kmem
crw-r----- 1 root operator 0, 56 Sep 16 15:53 md0
crw-r----- 1 root operator 0, 54 Sep 16 15:53 md1
crw------- 1 root wheel 0, 53 Sep 16 15:53 mdctl
crw-r----- 1 root kmem 0, 26 Sep 16 15:53 mem
dr-xr-xr-x 2 root wheel 512 Sep 16 15:53 net
lrwxr-xr-x 1 root wheel 8 Sep 16 15:53 net1 -> net/bge0
lrwxr-xr-x 1 root wheel 7 Sep 16 15:53 net2 -> net/lo0
crw------- 1 root wheel 0, 3 Sep 16 15:53 network
crw------- 1 root wheel 0, 48 Sep 16 15:53 nfs4
crw------- 1 root kmem 0, 15 Sep 16 15:53 nfslock
crw-rw-rw- 1 root wheel 0, 6 Sep 16 16:02 null
crw------- 1 root operator 0, 63 Sep 16 15:53 pass0
crw-r--r-- 1 root wheel 0, 9 Sep 16 15:53 pci
crw-rw-rw- 1 root wheel 0, 60 Sep 16 16:10 ptyp0
crw-rw-rw- 1 root wheel 0, 12 Sep 16 15:53 random
crw------- 1 root wheel 0, 36 Sep 16 15:53 speaker
lrwxr-xr-x 1 root wheel 4 Sep 16 15:53 stderr -> fd/2
lrwxr-xr-x 1 root wheel 4 Sep 16 15:53 stdin -> fd/0
lrwxr-xr-x 1 root wheel 4 Sep 16 15:53 stdout -> fd/1
crw------- 1 root wheel 0, 14 Sep 16 15:53 sysmouse
crw------- 1 root wheel 0, 37 Sep 16 15:53 ttyd0
crw------- 1 root wheel 0, 38 Sep 16 15:53 ttyd0.init
crw------- 1 root wheel 0, 39 Sep 16 15:53 ttyd0.lock
crw--w---- 1 ryuen tty 0, 61 Sep 16 16:10 ttyp0
dr-xr-xr-x 2 root wheel 512 Sep 16 15:53 ufs
dr-xr-xr-x 2 root wheel 512 Sep 16 15:53 ufsid
crw-r--r-- 1 root operator 0, 47 Sep 16 15:53 uhid0
crw------- 1 root wheel 0, 45 Sep 16 15:53 ukbd0
lrwxr-xr-x 1 root wheel 6 Sep 16 15:53 urandom -> random
crw-rw---- 1 root operator 0, 31 Sep 16 15:53 usb
crw-rw---- 1 root operator 0, 30 Sep 16 15:53 usb0
crw-rw---- 1 root operator 0, 32 Sep 16 15:53 usb1
crw-rw---- 1 root operator 0, 33 Sep 16 15:53 usb2
crw------- 1 root operator 0, 62 Sep 16 15:53 xpt0
crw-rw-rw- 1 root wheel 0, 7 Sep 16 15:53 zero
crw-rw---- 1 root operator 0, 57 Sep 16 15:53 zfs

Did you ensure your nic was also enabled in the bios? Was you cmos jumper also in the proper place? I'm unsure why your unit is rebooting unless it's having some heating issues or maybe some bad ram.