|"...the cpu light flashes..."|
The cpu - processor - does not have a light or led.
Do you mean the power led on the case flashes then goes out ?
The case the computer's mboard is in IS NOT A CPU !
Central Processing Unit (CPU)
ATI Radeon™ HD 5770 Graphics
■450 Watt or greater power supply with one 75W 6-pin PCI Express® power connectors recommended (600 Watt and two 6-pin connectors for ATI CrossFireX™ technology in dual mode) (for two cards or two video chipsets on one card)
Your "ocz xstream 600w" PS has more than the minimum recommended wattage capacity, for a card with one 5770 video chipset .
If your previous power supply failed, there's a strong chance that it fried something on your computer, most likely the mboard and nothing else.
That's even more l likely
- if it had a wattage capacity of 400 watts or less and the 5770 card was installed .
- if it was an el-cheapo PS
If the computer had a BESTEC power supply previously, then it's even more likely something was fried.
- if the power supply failed because of a power spike or surge caused by a power failure event (it doesn't matter if the computer was not running at the time, it could still have been damaged if the PS was plugged in and receiving live AC power) .
Otherwise, make sure that you have all the necessary connectors plugged in
- from the power supply to the mboard and the video card
Your mboard probably has two power sockets - a 24 "pin" one, and a 4 or 8 "pin" one. Both sockets must have connectors from the PS in them.
The power supply probably has a 20 +4 main power connector - in most cases, both the 20 pin and 4 pin connectors from the same wiring bundle MUST be plugged into the 24 "pin" socket.
Tthere must be a 6 pin PCI-E connector from the PS plugged into the video card's socket.
- from 3 or 4 wire cpu fan to the 3 or 4 pin cpu fan header - the mboard will shut of in a very short time if no rpm is detected from the cpu fan header by the bios to prevent the cpu - processor - from frying. The same thing will happen if the cpu fan does not spin, or in some cases if you use a cpu fan that spins slower than the bios expects the minimum rpm to be.
Make sure your ram is all the way down in it's slot(s) !
(If you removed it, make sure that it's installed in the right direction. If any ram module is installed backwards, the backwards ram module and the circuits of the slot it was installed in are both fried instantly when you attempt to boot the computer, and the mboard will not boot normally. )
Make sure your video card is all the way down in it's slot, and that it's bracket is attached to the case !
(If the card was not all the way down in it's slot, the card's circuits, and the slot it was installed in's circuits, can be easily damaged when you attempt to boot the computer.
If the metal bracket was not fastened down, the card can easily more upwards in it's slot when a video cable is plugged into it.)
Other things ?
If this is the first time this mboard has been installed in this computer case, make sure that there are no metal mounting posts under the mboard in any area where there is no mounting hole in the mboard, otherwise something can be shorted by the metal post on the underside of the mboard.