I did not especially other schedule today, so I bought the memory, and installed it in the PC of the sisters'. DDR400-1GB no-brand memory that was the upper compatibility was bought because PC's mother-board had been corresponding to DDR266 memory. Install, and start! ...what? Does not OS start??
The compatibility of PC is bad. Oh, it is the first experience!
Thus, I exchanged it for a somewhat expensive maker brand memory. And, I completed confirming the operation. I viewed memory-1.2GB on display. I was impressed.
It was a day when the importance of the compatibility security system had been actually felt.