Ubuntu Installation :: Cannot Load LiveUSB And Slow Boot After Forced Shutdown

I experienced what i perceive as the craziest thing during 2 years of using ubuntu. About some months ago, I have two ubuntu installed on my HP-mini netbook: ubuntu 10.04 64 bit (CAElinux) and kubuntu 10.04, and run without problem.

One day, the netbook's battery run out of charge and I forgot to plug it in. The ubuntu, as usual, went to hibernate, but without harddisk noise, so I forced it to shutdown by pressing power button (as i think it is not normal). What happened later was the partition of 10.04 was broken, it could not boot, it even affected another partition as the netbook couldn't boot kubuntu 10.04.

I try to run liveUSB and CD of both distro and the liveCD/USB boot stopped on loading screen. So I try another linux distro: PCLinuxOS, which was able to boot but took very long time. The partition of ubuntu 10.04 could not be accessed.

After installing PClinuxOS in replace of kubuntu, I scanned the ubuntu 10.04 partition and the partition was fixed, I could access the partition and could load to ubuntu 10.04, but it took very long time. Here how it loaded: first: blank screen with blinking cursor, then ubuntu load screen, then back to blank screen with blinking cursor, then it showed numbers and sentences, like some scanning works. It took long time before login screen appeared (about 10-15 minute, while the prevously normal boot time in my netbook was less than 1 minute), but once its done, the ubuntu worked normally. This also the case in the PClinuxOS and the reason it load very slowly.

After this, I try to boot the liveUSB of various linux distro, and found some could boot while the others not:

Able to load with unusual slow boot time:
PClinuxOS (latest)
Ubuntu 8.04
Fedora (latest)
Linuxmint 8 (based on ubuntu 9)

Can't load
ubuntu 10.04 and 10.10
kubuntu 10.04
latest linuxmint

The liveUSB boot could take 1 hour. I also try the latest Puppy, Gentoo and OpenSuse liveUSB but it couldn't boot, and it likely the liveUSB problem. I made the all the liveUSB with unetbootin. The ubuntu 10.04, 10.10, kubuntu and the latest linuxmint could not boot even after I scanned the ubuntu 10.04 partition. There was no problem with the liveUSB as it would load normally on another computer. I think it is just the variant of ubuntu 10 that is not being able to boot.

I was not content on this slow boot, so I try to format the two partition of ubuntu and PClinuxOS (there are another partitions though), and installed ubuntu 8. But it also happened to boot slowly as the previous ubuntu. Then I replaced it with linuxmint 8, and the same occurred. So I try to install windows on another partition, and it boot normally.

The question is, what is happening. Why do the forced-shutdown-of-ubuntu-10.04 affect another partition, to the boot of another distro? If my HD was broken, the Windows would load very slowly too right? Yes, in SMART Data (from disk utility) it showed "few bad sector", but i think this is not related to the slow boot. The ubuntu 10.04, 10.10, kubuntu and the latest linuxmint cannot boot until this moment. I am thinking there are some informations planted on my computer, that twist it to load some distro slowly, and prevent it to load some others. But where and what? (I almost arrived to the thought that this is supernatural!)

Because of my long story up there (as I think it must be reported), the conclusion is:
1. Ubuntu 10.04 on my netbook was forced shutdown (by me)
2. It caused the partition broken
3. After fixing the partition (by scan, but I forgot the command), it took very long time to boot, but the ubuntu itself run normally
4. It also affected the boot of another distro (slow down the boot time), but Ms.Windows boot time is normal
5. It also caused ubuntu 10 (and its variant) to not be able to boot from liveCD/USB
6. It also caused me going crazy

Now im gonna format the whole HD in hope of ubuntu 10.04 (and later) could boot again, but shall it fix the problem? (as formatting the previously ubuntu 10.04 partition did not solve the problem). Or should I buy another HD (or even computer) to install natty!