Tascam Fw 1884 Drivers

Hi, I have a problem with my fw-1884:
first of all, my computer is a power mac g4 800mhz and I own also an i-book G4 1,25 Ghz.. when I connect the fw 1884 with my power mac, the firewire led on the top of the audio interface turns on and after a few seconds suddently turns off.. what's the problem?
With the firewire led turned off the machine doesn't work at all..
So.. I thought it was a firewire problem.. but when I tried connecting the fw1884 on my i-book no problem was found..
Here's more: both computers have the same drivers (1.50) and operating sistem(osx 10.4.4 upgraded from 10.3.9 wich had the same problems)..
Is it the cable? new cable old problems..
Is it the firewire port? I've added a pci expansion to PMac today and no progress..
Please can anybody help me?! I'm going crazy..
PS:I've already written to the support but nobody answers at all..

Step 3: Now connect the Fire Wire cable and Power on the FW-1884. Open the FW-1884 Control Panel, its on the left hand side of the unit below 'SHORTCUTS'. Notice that below the sample rate the FW is reporting that it is 'In Sync'. Below 'TASCAM' is the driver version, in this case 'Version 1.80'. Feb 06, 2010 FW-1082 drivers: Drivers - Drivers for FW-1082: FW-1804 drivers: Drivers - Drivers for FW-1804: MX-View: Audio Editors & Recorder - MX-2424 Editing Software: SoftLCD: Drivers - LCD output emulation for Tascam FW-1884: US-122 driver: Drivers - Driver for US-122: US-224 driver: Drivers - Driver for US-244: US-428 driver: Drivers. Sep 28, 2014 Ken Nilsen Zargg BBZ Win 10 Pro X64, Cakewalk by Bandlab, SPlat X64, AMD AM3+ fx-8320, 16Gb RAM, RME Ucx (+ ARC), Tascam FW 1884, M-Audio Keystation 61es,.AKAI MPK Pro 25,.Softube Console1, Alesis DM6 USB, Maschine MkII Laptop setup: Win 10 X64, i5 2.4ghz, 8gb RAM, 320gb 7200 RPM HD, Focusrite Solo, +. 31 drivers total Last updated: Apr 8th 2020, 16:24 GMT RSS Feed. Latest downloads from TASCAM in Sound Card. Sort by: last update. Tascam US1800 Audio Interface Driver 2.00 for macOS 69 downloads.

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Hi, I have a problem with my fw-1884:
first of all, my computer is a power mac g4 800mhz and I own also an i-book G4 1,25 Ghz.. when I connect the fw 1884 with my power mac, the firewire led on the top of the audio interface turns on and after a few seconds suddently turns off.. what's the problem?
With the firewire led turned off the machine doesn't work at all..
So.. I thought it was a firewire problem.. but when I tried connecting the fw1884 on my i-book no problem was found..
Here's more: both computers have the same drivers (1.50) and operating sistem(osx 10.4.4 upgraded from 10.3.9 wich had the same problems)..
Is it the cable? new cable old problems..
Is it the firewire port? I've added a pci expansion to PMac today and no progress..
Please can anybody help me?! I'm going crazy..
PS:I've already written to the support but nobody answers at all..