At Ping An Lei's.
Machine: eMachine T6524
Monitor wavy screen.
Examination:
Monitor problem (unlikely).
Software driver problem (unlikely - no settings work on frequency/refresh rate).
onboard graphic card problem (possibly).
PSU power supply (possibly not functioning properly, causing magnetic disturbance).
Attempted solution:
used a generic video card PCI, doesn't work. No screen. Forums suggest to find very specific compatible cards. PCI-Express also mentioned on forum, but looks like ordinary pci slots to me.
or change PSU unit.