How to put my dell dimension 5150 from power save mode to plug and play

You might just need to correct or set the autoplay settings for DVD's but you need to provide more information especially what operating system before anyone can provide a proper solution. Also need to know if your drive plays any media at all.

Perhaps, not the best solution. However, it should get you going. Hold the power button for 15 or more seconds. The machine should then power down. You should then be be able to reboot. If that does not work, remove the battery and the power cable. Reinsert and then boot the machine. Make sure that you let it scan the disks to fix any disk errors.

Most times when you have flashing yellow light there is issue ether with cpu or motherboard. Just to be safe test the power supply and if ok then try to replace cpu and go from there. If power supply issue just replace it. Might be easier to take it to pc repair store. Good Luck

Dell chassis cannot accept a Non-Dell Motherboard with out modification. Generally simpler to use a Dell branded motherboard. You can get one here: http://shop.ebay.com/i.html?_nkw=dimension+5150+motherboard+&_cqr=true&_nkwusc=dimension+5150+motherbaord&_rdc=1

What makes you think you have a dead power supply? I would look at the connectors and see if there are 20 or 24 going into the Motherboard main connector. Then look for a 4 pin connector plugging in near the CPU. If it looks like the mounting holes line up, you have a winner. Most are interchangeable anyhow. Try to get some SATA connections on your new one.

If an application is attempting to access the CD drive, the door will close. Put the CD in first and then launch the application.

Also possible a problem with the eject/load mechnism in the CD drive.

Here is the Dell Troubleshooter for this issue: http://support.dell.com/support/topics/global.aspx/support/dsn/en/tree?c=us&cs=2684&l=en&s=pub&journalid=751A2FF07E7978A3E040AE0AB8E109D1&treeid=011360B8243248349C306481A954B356&Query=ZGltZW5zaW9uK25vK3Bvc3Q=&SystemID=DIMENSION%205150/E510&ServiceTag=&contenttype=-1&os=-1&component=-1&lang=-1&doclang=en&toggle=false&dl= you can also contact Dell tech support at 800-624-9896 in USA

It will only require full power if you're playing games. If not, then your 305w power supply will do.

Could be a number of things, First take the ram out and then put it back in and see if that helps. next I would unplug any devices not required to start the computer.
You need to be familiar with the inside of the computer to do this.
Most likely suspect however is the power supply.

Sounds like a problem with the video card. Cross check the connections to the CPU. If its all fine, Then Connect the monitor to a diffrenet pc and then use the monitors keys to change it to a plug and play mode.This might help with ur problem