Last thing until it works...need auto startup!

**detz** · 08-12-2002, 03:53 PM

I have an ATX motherboard and there is not option to turn on the power after power failure or anything so I need some circuit to auto start the power when the car is turned on. I don't want to run another switch through my car so does anyone know of a WORKING way to do this. I've read many thigns and tried many different circuits but none seem to work right, they either reset after a given time or don't work at all.

**Rob** · 08-12-2002, 04:04 PM

Not tested, but should work, and has the benifit of being simple. Use a relay with a two way switch (SPDT for the elecy people), connect the power good wire from the ATX to the relay coil along and the other end to ground. The connect the relay switch across the reset button so that, when the power is on the switch is open, and when it's off the switch is closed.

This should automatically restart the computer if the power dies.

As I said not tested and off the top of my head.

**detz** · 08-12-2002, 08:01 PM

I've tried so many things...if I connect the "power on" to ground the ps turns on but it does not post...

**jboy** · 08-12-2002, 08:19 PM

What brand of MOBO?
Maybe look for another bios

**Squeezer** · 08-13-2002, 08:52 AM

if you are using an ATX power supply connect pin 14 (the green wire) to any one of the black wires.

**detz** · 08-13-2002, 10:21 AM

that does not work, the computer will not post when I do that, the ps comes on but nothing happens.

**detz** · 08-13-2002, 08:08 PM

PLEASE PLEASE someone help, nothing I've tried works

**izaram** · 08-14-2002, 12:58 AM

jboy mentioned to you maybe getting another BIOS. Is that a feasible solution for you? Take a look at this page:

http://www.esupport.com/biosupgrades/why.cfm

They sell BIOS upgrades and one of the features their BIOS has (according to their page) is instant booting. I have personally never used their services, so I couldn't tell you how (un)reliable they are. Also, I can't seem to find a prices page, dunno how much they would charge, but hey, if you really want your PC to boot automatically.

Anyway, hope that helps. Good luck.

BTW, there's a few companies that offer this kind of service, this is the first one that came up in a search.

**Aaron Cake** · 08-14-2002, 08:04 AM

Have you considerd seraching the Hardware and Power Supplies forum? This has been covered several times, with circuits based on the 555 posted in almost every thread. Not sure if you have tried any of those circuits, but I haven't heard any complaints. All you need is a timer to momentarily trip a small relay to pulse the "power on" pins. NOT complicated.