How common are defective oem parts?

[Cainxinth]

I built three computers recently.

T-Bird 1.4
MSI K7 Master
Crucial 512MB PC-2100
ASUS V8200 Deluxe
IBM 40GB ATA/100 7200 RPM
Turtle Beach Santa Cruz
Plextor 16X CD-RW
Pioneer 16X Slot-In DVD-ROM
Linksys 10/100 NIC
Mitsumi 1.4MB
NEC FE950+BK CRT
Antec 1040B w/ 400W
Enlight 80mm High Output Fan
Taisol CGK760092 HSF / Artic Silver II

Of all those various components i got two defective parts. One motherboard had a sporadically malfunctioning agp port, and one of the video cards never worked at all. Is it common to get two defective parts when building just three computers?

 

[OS]

I would like to know also, some of you guys run your own biz so you must know

 

[TunaBoo]

That seems high. We try to get parts on a palet from an air ride truck. Then they tend to be okay. MAYBE 1 bad part per 10 builds. But that is DOA parts. Some parts will fail within the first week/month/year. Most computers will have something fail in 2 years.