Let close this subject: After change SB460 chip with

Let close this subject:
After change SB460 chip with litle brown spot on letter X (in IXP460 marking), Notebook started to work as new:)
I tested him for few days and there was no problems.
I have another 3 notebooks with same problem. Some of them are turning on but with no recognition of IDE/SATA drives or not turning on at all.
All have same phisical manifestation - brown spot.