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Too weak PSU?

Last response: in Systems
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Hello,

After putting all together the computer just shuts off after few seconds of booting. It won't start again if PWR ON button is pressed, only if cable out of the socket and in again. I had mobo checked - worked fine, checked the PSU by bridging - worked.
So my only conclusion would be that it doesn't have enough power.
Could anyone suggest how big PSU I should buy. Or if anybody has other explanations to this problem I'd really appreciate it.
My current setup:
PSU: Xilence 550W ATX2.2
Mobo: Asus M4A87TD EVO
CPU: x6 1055T
GPU: GeForce GTX 460 1gb
HDD: Samsung F3 1TB 7.2kRPM
SSD: Kingston 64GB
Memory: Apacer 2gb ddr3 x4
ODD: LG DVD-/+RW 22x

All the wires from PSU are used.

More about : weak psu

More details on the problem: On 1st power up I managed to install w7 and started installing drivers which needed restart which turned to a shut down and would start again. Pulling the cable was the only successful thing to get it up nd running, reinstalled the w7 thinking it was the drivers, random shut down again. After each try the length of running shrunk to only 1/2 CPU spin.

Could there be another explanation to this problem or is it most likely the PSU?
Related ressources

^That's Thermaltake Toughpower. OCZ would also be better than Xilence.

The Silverpower Blue Lightning has very short CPU and mobo connectors, so it would only be suitable in a case that mounts the PSU at the top. Apart from that it's not too bad.

I have not heard of Apacer as a RAM brand before, don't know what kind of quality they bring to the table?

If I knew where you bought from and a budget I could find you a very nice power supply.
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