4650 not working with 275 psu - help!

I have a Dell Dimension 9200C with a 275 watt psu.
I purchased a Sapphire HD 4650 w/ 512mb DDR2.
My computer won't boot. Doesn't seem to have enough power but I keep seeing this card recommended for others with slim pcs and little power as well. I am upgrading from ATI X1300.

I'm hoping a bios update will help. Anybody have any other advice before I give it another whirl?

Dell Dimension DXCO61
Vista Ultimate SP2 32-bit
4 GB ram
2 answers Last reply
More about 4650 working help
  1. not enough juice in psu if doesn't boot
  2. Why does it work for others with the same psu or 250 watt?
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