Note: For those that missed the reports earlier this year (in the drive database) - some Powerbook G4 owners reported that earlier bought DVR-K04L drives (from MCE, OWC, etc.) were not recognized in some models (firmware set to Slave mode, which is normal for Mac Mini models or Cubes with one IDE bus, but PB G4s have a separate optical drive bus and are normally set to Master).
Not all PowerBook G4 owners reported a problem with slave set drives though (but several did) and there was at least one report in the database here on mtg screw tension causing drive problems (drive not recognized or a corrupted drive ID depending on screw tension), so I'm not sure if that was a factor in the other problem reports.
Just a FYI if you're buying a K04L for a PowerBook G4 (vs a Mini, Cube or other mac with only one IDE bus) you might want to check with the dealer first. (OWC stopped selling the DVR-K04L drive as powerbook G4 compatible after the initial problem reports.) And BTW - Mac parts dealers have K04Ls without a bezel attached as Minis, Cubes, PowerBook G4s, etc.. don't use drives with a bezel attached, but for use with a system that needs one (like for PB G3 Exp. bay use), PC parts dealers like Mwave usually sell drives with a bezel attached. (Although often there are bezel mods needed to fit in the expansion bay housing.)

"Mike,
I have a similar configuration to others who have had the modem problem (MDD, v.92 internal), dial-up *was* working fine until the modem-on-hold thing got used and then it started with the "could not open..." message. I did some quick voodoo (reset nvram in open firmware, new location, etc.) and then tried out the internal v.90 modem that I had laying around from an older machine and am online with that. (I asked for more info on the v.90 modem-Mike)
I'm pretty sure all G4 Mac modems are compatible, at least the v.92 modem that came with the MDD, a v.90 modem from a GigE and a Stealth Serial adapter all work in the various G4s that I've tried them in.

I'll try the v.92 again in a bit and see if its time out has made it see things my way. I did just install 10.4.1 but since they didn't address anything modem related that probably doesn't mean anything. (he later wrote) It didn't resolve itself a few hours later. I then tried it in the GigE with the same hard drive and got the same results. Then I grabbed the disk that I'd tried 10.4 out on to make sure the modem didn't have any problems on my system (and it didn't, then) and that failed now too. (I asked if he still had the v.92 modem installs to send a clip of the details on it from Apple System Profiler-Mike)

I'd suggest disabling the online call notification thing for dial-up users with the suspect configuration in the meantime.
-Steve "

If any readers with Tiger modem problems find that helps (or the tip in the report below), let me know. Thanks. (Note - one reader later said to also check the Modem settings/country setting.)
Another reader mentioned a tip he used in Panther for a modem problem:

"My modem works fine on Tiger. (I asked what mac model/modem he was using-Mike)
I do know that there was an issue on Panther that caused my Mac to freeze when trying to connect via the modem. I solved this problem by deleting /var/log/ppp.log. To access this from the Finder, select the Go menu > Go to folder and enter in /var/log/ then press return. Find ppp.log, move it to the trash (you'll be asked for your administrator password) and empty the trash. After that, try connecting again.
It worked for me; maybe it'll work for others.
Nick M. - Mac Editor
Deep Thought - inside the minds of geeks
http://www.dtgeeks.com/ "

I'd tend to doubt that will help since I think some users with a modem problem even tried a Tiger clean install (erase and install).

• MacWireless Announces Whip and Outdoor Omni Antennas
• Darkwaters Gaming Network v1.2 (play Xbox system link games on the net)
• Seagate to ship 120GB/5400rpm and 100GB/7200rpm notebook drives (PCworld)
• Sony shrinks HD camcorder size/price (PCworld)

CDRW Drives:
• USB Iomega CDDVD482416E (48x24x48) used w/iMac (OS X 10.3)
  (Using Patchburn 3 for iApps burn support.)
  
  Hard Drives:
• IDE Serial ATA PCI card connected Seagate 200GB in (MDD) Dual G4 DDR (OS X 10.3) (problems noted with controller card)
• IDE Seagate ST3300831A 300GB in iMac G4 (OS X 10.4)
  (iMac G4 has native big drive support. Used iMac G4 15in take-apart article here)

You can find full owner reports (latest shown first) by searching the database by drive/brand/interface/mac models (the latest reports are shown first in searches). For guides to installing CD/CDRW/DVD drives or Hard drives in many mac models, see the IDE Articles page. The Firewire articles page also has guides on case kits, installing drives, etc.
If you've added a IDE, SCSI, Firewire or USB hard drive, CDRW, tape drive, etc. make sure you add a report to the database. (If you post an updated entry - make sure you use the same name, etc. as you did before so I can find your past entry. Thanks.)
(Incomplete entries are deleted. Do not post questions in the database, it's for drive reports not questions on what drive to buy - for that try searching the database for reports from owners of your mac model on the drive type/brand/interface, etc. you're interested in.)

• Other World Computing G4 1.2GHz in (sawtooth) G4/AGP (rated 10)
• Powerlogix G3 900MHz (at 950MHz) in B&W G3 (rated 10)
  (includes comments on his OS 9/Voodoo5 gaming rig performance)
• Updated May 12th report on eMac 1GHz overclocking
  
  (Full reviews of G4 and G3 upgrades compared to stock CPUs, including real world apps/game tests, install info, etc. are linked at the CPU upgrades page. OC/CPU module articles are on the Systems page.)

(Warning - Overclocking may not be reliable and could lead to hardware failure or corrupted data.) You can find the full reports by searching the database selecting the indicated Mac model and upgrade card brand/type. If you've upgraded the CPU on your Mac, please post an entry in the database. Search the database for entries from most every upgradable Mac model *before* you buy. (Searchable by mac model/upgrade brand).