Power up replaced power supply, still won't power up. possible motherboard?

This is almost always the power supply. How exactly did you "check the power supply"? You checked all 12 or so voltage outs under load?

If replacing the power supply doesn't work, replace the motherboard.

Here below are possible causes and troubleshooting steps of laptop that can't power on, hope it may help:
Possible causes:

1. AC adapter failure.
2. Power jack failure.
3. Motherboard failure.

Possible troubleshooting steps and repair solutions:
1. Test the AC adapter with a digital multimeter. It's possible that you have a failed AC adapter. If you don't have a multimeter, test your laptop with another known good AC adapter.

2.It's possible that power jack (socket where you plug the AC adapter) is broken. Remove the motherboard and take a closer look at the power jack. In some cases you can fix the jack by resoldering it on the motherboard. In other cases you have to replace the jack with a new one. Using a multimeter, test if the power goes to the motherboard through the jack.

3. If replacing the AC power adapter and jack on the motherboard doesn't help, most likely you have a bad motherboard. Replace the motherboard.

Here below are possible causes and troubleshooting steps of laptop that can't power on, hope it may help:
Possible causes:

1.Dell Vostro A840 AC adapter failure.
2. Power jack failure.
3. Motherboard failure.

Possible troubleshooting steps and repair solutions:
1. Test the AC adapter with a digital multimeter. It's possible that you have a failed AC adapter. If you don't have a multimeter, test your laptop with another known good AC adapter.

2.It's possible that power jack (socket where you plug the AC adapter) is broken. Remove the motherboard and take a closer look at the power jack. In some cases you can fix the jack by resoldering it on the motherboard. In other cases you have to replace the jack with a new one. Using a multimeter, test if the power goes to the motherboard through the jack.

3. If replacing the AC power adapter and jack on the motherboard doesn't help, most likely you have a bad motherboard. Replace the motherboard.

Here below are possible causes and troubleshooting steps of laptop that can't power on, hope it may help:
Possible causes:

1. AC adapter failure.
2. Power jack failure.
3. Motherboard failure.

Possible troubleshooting steps and repair solutions:
1. Test your acer travelmate 4320 ac adapter with a digital multimeter. It's possible that you have a failed AC adapter. If you don't have a multimeter, test your laptop with another known good AC adapter.

2.It's possible that power jack (socket where you plug the AC adapter) is broken. Remove the motherboard and take a closer look at the power jack. In some cases you can fix the jack by resoldering it on the motherboard. In other cases you have to replace the jack with a new one. Using a multimeter, test if the power goes to the motherboard through the jack.

3. If replacing the AC power adapter and jack on the motherboard doesn't help, most likely you have a bad motherboard. Replace the motherboard.

Here below are possible causes and troubleshooting steps of laptop that can't power on, hope it may help:
Possible causes:

1. AC adapter failure.
2. Power jack failure.
3. Motherboard failure.

Possible troubleshooting steps and repair solutions:
1. Test the AC adapter with a digital multimeter. It's possible that you have a failed AC adapter. If you don't have a multimeter, test your laptop with another known good AC adapter.

2.It's possible that power jack (socket where you plug the AC adapter) is broken. Remove the motherboard and take a closer look at the power jack. In some cases you can fix the jack by resoldering it on the motherboard. In other cases you have to replace the jack with a new one. Using a multimeter, test if the power goes to the motherboard through the jack.

3. If replacing the AC power adapter and jack on the motherboard doesn't help, most likely you have a bad motherboard. Replace the motherboard.

Hope you just need to replace the hp power supply to fix this problem.

The specs say the PSU is ATX compatible. Whether that is for the connector only or for the whole power supply is something you will have to determine.

If you have an ATX power supply handy (like in an old computer) give it a try. This one is only 300 Watts so it won't likely be expensive to replace.

Have a look at: http://www.techspot.com/community/topics/dell-dimension-1100-shuts-down-after-20-seconds.135987/

It's very possible that when your power supply died so did your motherboard. Especially if a power surge was involved..

The only way to increase memory capacity on any motherboard is by replacing it with a new one that can take more. Rather than do that in your Sony computer, though, you should probably consider replacing the entire computer. Here's why.

First, you may not be able to fit a different motherboard into the Sony case. Many computers were made using proprietary motherboards with non-standard sizes or mounting hole locations. Then, they often have non-standard connectors for the front panel switches and lights, making it difficult to hook up. The power supply will be a problem. Guaranteed it will be too low-power for newer motherboards and won't have the right CPU power output connector, so you'd need to replace that as well. But a standard power supply may not fit into the case; again, proprietary power supplies with odd sizes were often used. So now you're looking at replacing the motherboard and power supply, and possibly the case, just for starters.

You'll need a new processor and RAM with the new motherboard. No new board will support your current processor and RAM. And you'll need a new hard drive and probably optical drive as well. New boards are designed for SATA (serial interface) drives. There won't be enough connectors to re-use the older IDE devices in your Sony.

You'll probably need a new copy of WIndows, too, unless your Sony still has an XP or Vista product key sticker on it. You won't be able to use any factory restore discs because the hardware will be completely different, so you'll be doing a fresh installation from scratch.

The bottom line is that you're going to end up building a new computer. If you just want a basic computer for the typical things like Web surfing and office use, you can buy a name-brand system for less than the price of all the parts, and it will come with Windows installed and will be ready to go. If you're wanting a super gaming machine or something tailored for a specific use, and you're willing to do the work, then by all means pick up the individual parts and roll your own.

It is possible that you may have a bad power supply and need to have it replaced, it could also be something simple such a a loose connection on your motherboard. I would start out by removing the power supply from the machine and having it tested at a computer shop. Also make sure everything is plugged in correctly on the hardware. Let me know if this helps please, Jeff from fixya

If the power supply is good then your motherboard must have gone bad during a surge.