G4 AGP upgraded and now freezing and needs restart???? HELP

hey guys, so i recently bought a powermac g4 agp "sawtooth" and upgraded it. i put in a 128gig seagate hdd, a 1ghz sonnet encore gt processor, 1 gig ram (2x128 and 2x256), and then filled the pci slots with a radeon 9200 128mb graphics card, a 4 port usb 2.0 card, and a wireless pci card because the g4 could only take the old airport and i wanted 54mbps, finally a pioneer dvd burner to replace the old dvd ram cd rom drive... sooo all these things worked as they were supposed to when i added them, but now with them all in the computer has been freezing and telling me i need to reset it with the little error window, i thought it was leopard so i downgraded back to tiger and same restart problem is occuring.. wondering if its the power supply cannot support all the peripherals? no idea though.. any suggestions???
also a problem ive had ever since i got the machine up and running when i replaced the motherboard... not every time the computer goes to sleep but sometimes it wont wake up from sleep... it sounds like the computer is waking up but there is no image sent to the monitor... any idea whats goin on here??

First try a PMU reset. See Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial
Is the error window you are getting in multiple languages? If so, you are getting a kernal panic. KPs are generally caused by hardware, frequently RAM & sometimes by USB devices. To start troubleshooting remove the wireless card & USB card & disconnect all external devices except your mouse, kbd & monitor. Post back with the results. Basically, you have made too many changes at one time & it's dificult to know the cause.
May be a solution on one of these links.
Mac OS X Kernel Panic FAQ
Mac OS X Kernel Panic FAQ
Resolving Kernel Panics
12-Step Program to Isolate Freezes and/or Kernel Panics
 Cheers, Tom

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