I just upgrade a computer for my brother. It got a new processor/motherboard/RAM(MB bundle) and a new sata hard drive. clean install of XP pro sp2. I left it and it was in full working order. not long after my brother had he found 3 problems 1 of the optical frive was working full (either though i use it to install OS) it would't stut down (either though I stut it down fine) and couldn't install his wireless USB stick First thing I did was to check the CD drive (cables etc) and i saw that the jumper was set to cable select so I set it to master as it should of been, after what the computer failed to be able to boot it would frezze on a black screen after you see the window logo. I put it back to cable sect just to check it if it was that, but not is still didn't want to boot. So my next step was to boot in safe mode. was in safe mode I installed sp3 waht corrected the first 3 problems, but not the boot problem, but then it did boot suddenly after a few restarts although the CD drive problem a the wireless stick problems were back like sp3 hadn't been install. so I went back into safe mode where those 2 problem no longer there. and after a restart i was unable to boot normally again. I'm really confuzzed (and so is the computer it seems) can some one please help.