[SOLVED] Can't log into squeeze after updating

[helai]

system: debian squeeze

Yesterday,after I have run dist-upgrade then reboot my computer ,it stop at the logging while the screen has the sentences just like

*****
intel8x0_measure_ac97_clock measured 52292 usecs
intel8x0 clocking to 48000
done

but no errors showed on screen,just stop at there
who can help me tell me how to figure it out

after I click ctrl-c it still can go through,and the next sentence is "setting the system clock", then it log into the system,but next time it still stop at this step
here is my sys log

Jul 11 07:06:34 localhost kernel: [   11.974191] ACPI: PCI Interrupt 0000:00:1f.5[b] -> GSI 17 (level, low) -> IRQ 17
Jul 11 07:06:34 localhost kernel: [   12.130806] input: ImPS/2 Generic Wheel Mouse as /class/input/input4
Jul 11 07:06:34 localhost kernel: [   12.198700] parport_pc 00:0a: reported by Plug and Play ACPI
Jul 11 07:06:34 localhost kernel: [   12.198700] parport0: PC-style at 0x378 (0x778), irq 7 [PCSPP,TRISTATE,EPP]
Jul 11 07:06:34 localhost kernel: [   12.471514] intel8x0_measure_ac97_clock: measured 51353 usecs
Jul 11 07:06:34 localhost kernel: [   12.471584] intel8x0: clocking to 48000
Jul 11 07:06:34 localhost kernel: [   21.188294] Adding 1951856k swap on /dev/sda5.  Priority:-1 extents:1 across:1951856k
Jul 11 07:06:34 localhost kernel: [   21.657618] EXT3 FS on sda7, internal journal
Jul 11 07:06:34 localhost kernel: [   21.921078] loop: module loaded
Jul 11 07:06:34 localhost kernel: [   21.997805] w83627hf: Found W83627THF chip at 0x290
Jul 11 07:06:34 localhost kernel: [   21.997805] w83627hf w83627hf.656: Reading VID from GPIO5
Jul 11 07:06:34 localhost kernel: [   22.053802] p4-clockmod: P4/Xeon(TM) CPU On-Demand Clock Modulation available
Jul 11 07:06:34 localhost kernel: [   23.199554] fuse init (API version 7.9)

I think some configuration of "setting the system clock" is wrong, So how to figure it out

Thanks
Helai

[helai]

solved:

after I put the option "quiet" attached the sentence of " kernel /vmlinuz-2.6.26-2-686 root=/dev/sda7 ro quiet" in the file /boot/grub/menu.lst,then when booting the OS hangs when screen shows message" waiting for /dev to be fully populated...done"
after google the INTERNET, I find it was caused by the sentence "CONCURRENCY=shell" which I put it in the file /etc/default/rcS long before by following which optimization instruction.

so remove it and go through anyway.