no monitor/dvd after installing new mobo & ps

June 19, 2011 at 21:34:01
Specs: Windows Vista, 8g
My computer died, ran diagnostic due to blinking light on back of power supply. Plugging power supply to motherboard caused light to blink. Ordered new motherboard...nothing. Replaced power supply, lights up and powers on, but no signal is going to monitor. We have a MSI HDMI card, upgraded ram. We have tried removing these to rule out, but still nothing. I have reset the bios, nothing. I tried holding the power button down when pc is off, nothing. When the DVD player is plugged into mobo, it will not work. If I unplug from mobo, it works. I get the same results with the new mobo and the old mobo. Please help! :)

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June 25, 2011 at 18:42:45
Computer - Is it Dell or ?? Model? Power supply has a model and a rating on it. That will come in handy.
If the power supply was the issue causing the original board to fail, it may have did it to the new one too! A Power supply checker is a very handy dandy device to have on hand when things stop working.
Gotta have a good "battery" first. Swapping parts is not always the best way to go.

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June 25, 2011 at 20:38:17
thanks for the reply

It's an HP a1430n. Power supply is DX-400WPS.

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June 26, 2011 at 14:55:34
A power supply is best purchased by weight. The heavier is usually the better device due to quality components having more weight. Occasionally, technology can reduce weight, but so far this is a good indicator to go by.
Does this new power supply test good? How about the old one?

The mainboard is a socket 939 Asus A8N-LA. I hope you found it cheap. Those are almost antique. I have two in the "toast" bin. They are bad because the RAM was removed from both (swap) while the unit was still plugged in, but powered down. Son learned on that one. Very touchy boards these days. 5 volts of static / power will toast 'em, and just about everything attached at times.

"When the DVD player is plugged into mobo, it will not work."
Does the dvd work in other systems? I would test in an external USB adapter / case to have something to protect the computer in the event the DVD is bad. It sounds like it may be bad too. Personally, I'd just replace it as it is tooo cheap. $30 or so.

"but no signal is going to monitor"
have you tried another monitor? Testing this monitor on another system? Have you looked at the connector to see if any pins are bent? Is it seating properly?

Sounds like lightening... ;-(

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