Gamezgirl, 1st, from what you are reporting, it sounds like you need to update your motherboard Bios & chipset. Go to your motherboard manufacturer site & look for Bios & chipset update on your board. Follow update instructions exactly. Print them out beforehand if you are nervous. You will probably need to make a Dos boot disk, do a google or forum search on how to do.
If, after doing this or if you already have the latest Bios & drivres and you still have recognition problems, then connect the drive to another computer with USB 2 capability to see if the problem follows the drive. If so, RMA it.
Once you have the drive recognized properly we can concern ourselves with what chipset the case has.
What BenQ firmware do you have on the drive? Will be listed in CD Speed "DW1621 V4xxx" at top of window.
In order to do a burst rate test you must have a burned or pressed disc in drive.
Better still, put a blank disc in, start CD Speed, go to file/options and select Standard test. Check Burst Rate & Create Data Disc...choose good write speed for disk... do not overspeed to max. if your disc has 16X overspeed capabilities like TY T02, burn it at 12X. You could do a QScan to determine recommended burn speed on disc.
Then go to options/capture and set picture format as png.
Say hit OK, then hit start. When done, use scroll box at bottom of graph to display time of burn & burst rate, save file.
Go to Extra in file menu, then Disc Quality, set speed at 8X, hit start save when completed then post here.