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VOIP Phone -- Daisy Chaining Fails ?

Any ideas on how to fix below "Test #1" ?
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Details
  ** phone and computer both get
     assigned 192.168.28.x IPs
  ** using my Cisco Catalyst 2550
     managed switch works fine for all
     3 of the below tests for 10+ days
  ** using my Cisco Catalyst 3560G
     managed switch makes below
     "Test #1" fail, even when it looks
     like PORT is programmed for "AUTO"
     everything and not on a weird VLAN
  ** factory resetting the phone, using
     a different phone, using external
     power supply, changing computer and
     phone to a static IP, etc do nothing
     to solve the issue
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Test #1 = phone works, computer fails
 1. from Cisco switch port
 2. to Yealink DHCP-based IP phone
 3. to Desktop DHCP-based IP computer
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Test #2 = phone works
 1. from Cisco switch port
 2. to Yealink DHCP-based IP phone
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Test #3 = computer works
 1. from Cisco switch port
 2. to Desktop DHCP-based IP computer
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Yealink T28P, already set to Bridge mode, phone works fine with COMPUTER if I plug it into Cisco Catalyst 2550, but only works as STAND-ALONE when plugged into Cisco Catalyst 3560G, both Cisco's seem to have NO weird VLAN settings.

Any ideas like "Cisco Catalyst 3560G" has something build-in for security that says "Allow Daisy Chain = NO" ?
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