DVD drive when plugged stop system from booting past BIOS

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So my system was just working fine when my PSU decided to choke on me. Went to the store and bought a 550W power supply made in China by power bay. More power then I need but for the same price I thought why not. I use to have an Antec 380W. Now I figured out when I plug the DVD drive the system won't boot past the bios. If the DVD drive is unplugged then my computer works fine but I have no DVD. I know my DVD is working because I plugged it once the pc booted past the bios and managed to install my antivirus. What is the problem?? My old psu had 6 4 pin (molex) connector which two were for fan only. This new psu has only 3 molex which is really ackward to connect one HDD, one Video car and my DVD and the case fan. Should I go get a decent brand with more connectors or is it something else that cause the problem ???

Thanks
 
You will need to get a molex adapter. Obviously your DVD isn't hooked up correctly. What's ackward? backward?
 
Thanks, I'll check if an adapter does the trick. I thought it was awkward to have three molex to plug four devices (hdd, fan, Video card, drive). It makes sense in a way with newer system using SATA but I don't have that so. If worst comes to worst and the adapter doesn't work I'll fork out an extra 30$ and get a 450W PSY with six molex plug. Will see if that makes a difference. Thanks again for your reply.
 
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