ok... the dmesg output is:
Copyright (c) 1992-2006 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights reserved.
FreeBSD 6.1-RELEASE-p11 #3: Wed Dec 20 18:51:13 PST 2006
root@PCBSD.localhost:/usr/obj/usr/src/sys/PCBSDv1.3
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Athlon(tm) Processor (1410.20-MHz 686-class CPU)
Origin = "AuthenticAMD" Id = 0x644 Stepping = 4
Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MC A,CMOV,PAT,PSE36,MMX,FXSR>
AMD Features=0xc0440800<SYSCALL,<b18>,MMX+,3DNow+,3DNow>
real memory = 536788992 (511 MB)
avail memory = 515915776 (492 MB)
kbd1 at kbdmux0
acpi0: <ASUS A7V266> on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0xe408-0xe40b on acpi0
cpu0: <ACPI CPU> on acpi0
acpi_throttle0: <ACPI CPU Throttling> on cpu0
acpi_button0: <Power Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
agp0: <VIA 8367 (KT266/KY266x/KT333) host to PCI bridge> mem 0xfc000000-0xfdffffff at device 0.0 on pci0
pcib1: <ACPI PCI-PCI bridge> at device 1.0 on pci0
pci1: <ACPI PCI bus> on pcib1
pci1: <display, VGA> at device 0.0 (no driver attached)
rl0: <D-Link DFE-530TX+ 10/100BaseTX> port 0xd800-0xd8ff mem 0xed800000-0xed8000ff irq 10 at device 15.0 on pci0
miibus0: <MII bus> on rl0
rlphy0: <RealTek internal media interface> on miibus0
rlphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
rl0: Ethernet address: 00:40:05:32:cb:b5
isab0: <PCI-ISA bridge> at device 17.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <VIA 8233 UDMA100 controller> port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xd400-0xd40f at device 17.1 on pci0
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
uhci0: <VIA 83C572 USB controller> port 0xd000-0xd01f irq 5 at device 17.2 on pci0
uhci0: [GIANT-LOCKED]
usb0: <VIA 83C572 USB controller> on uhci0
usb0: USB revision 1.0
uhub0: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1: <VIA 83C572 USB controller> port 0xb800-0xb81f irq 5 at device 17.3 on pci0
uhci1: [GIANT-LOCKED]
usb1: <VIA 83C572 USB controller> on uhci1
usb1: USB revision 1.0
uhub1: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhci2: <VIA 83C572 USB controller> port 0xb400-0xb41f irq 5 at device 17.4 on pci0
uhci2: [GIANT-LOCKED]
usb2: <VIA 83C572 USB controller> on uhci2
usb2: USB revision 1.0
uhub2: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
fdc0: <floppy drive controller> port 0x3f2-0x3f5,0x3f7 irq 6 drq 2 on acpi0
fdc0: [FAST]
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
ppc0: <ECP parallel printer port> port 0x378-0x37f,0x778-0x77f irq 7 drq 3 on acpi0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/9 bytes threshold
ppbus0: <Parallel port bus> on ppc0
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
sio0: type 16550A
sio1: <16550A-compatible COM port> port 0x2f8-0x2ff irq 3 on acpi0
sio1: type 16550A
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
pmtimer0 on isa0
orm0: <ISA Option ROMs> at iomem 0xc0000-0xcc7ff,0xd0000-0xd3fff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
uhub3: vendor 0x05e3 USB2.0 Hub, class 9/0, rev 2.00/7.02, addr 2
uhub3: 4 ports with 4 removable, self powered
ukbd0: vendor 0x1241 USB Keyboard, rev 1.10/2.80, addr 3, iclass 3/1
kbd2 at ukbd0
uhid0: vendor 0x1241 USB Keyboard, rev 1.10/2.80, addr 3, iclass 3/1
ums0: Microsoft Basic Optical Mouse, rev 1.10/0.00, addr 4, iclass 3/1
ums0: 3 buttons and Z dir.
Timecounter "TSC" frequency 1410204788 Hz quality 800
Timecounters tick every 1.000 msec
ad0: 78166MB <Maxtor 6Y080L0 YAR41BW0> at ata0-slave UDMA100
acd0: DVDROM <HL-DT-STDVD-ROM GDR8162B/0015> at ata1-slave UDMA33
Trying to mount root from ufs:/dev/ad0s1a
cd0 at ata1 bus 0 target 1 lun 0
cd0: <HL-DT-ST DVD-ROM GDR8162B 0015> Removable CD-ROM SCSI-0 device
cd0: 33.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present
uhid1: vendor 0x0d8c C-Media USB Headphone Set, rev 1.10/1.00, addr 5, iclass 1/1
now how i can proceed???
thanks a lot!!!Marco