RNDU2000 REINSTALL OS

Recently,my nas has driver fail,so I reinsert two empty hdd,try to  reinstall OS,but it stuck on

Loading kernel modules...       here is the tty output. 

CPU : Intel(R) Atom(TM) CPU D425 @ 1.80GHz
Speed : 1.80 GHz

Press DEL to run Setup (F4 on Remote Keyboard)
Initializing USB Controllers .. Done.
2038MB OK
USB Device(s): 1 Storage Device

SYSLINUX 3.31 v1.07 Tue Feb 15 11:31:02 PST 2011
Copyright (C) 1994-2005 H. Peter Anvin
Debug Serial Port Enabled
Normal
FactoryDefault
OSReinstall
TechSupport 0078
SkipVolCheck
MemoryTest
TestDisks
Loading aborted.
Normal
FactoryDefault
OSReinstall
TechSupport
SkipVolCheck
MemoryTest
TestDisks
Normal FactoryDefault FactoryDefault
Loading
18
1B
NETGEAR
ReadyNAS
09/08/2010 ReadyNAS-ProUltra2 V1.4

kernel.............................................................
Loading initrd.gz.............................Ready.
▒sky2 0000:01:00.0: Fall back to sk98lin instead.
sky2 0000:03:00.0: Fall back to sk98lin instead.

Starting the boot process...
Loading kernel modules...

what can I do about this?I already flash the internal USB driver yet.