Sorry, I'm kind of a newbie at this, but I really need some help with my computer! What's Wrong With My Mac Pro? My computer is a Mac Pro G5, It's an early 2005, Power Mac with a 400 GB hdd and 4 GBs of RAM. A few weeks ago it stopped starting up, and it wouldn't start up for several days. I was thinking that it was the hardrive because all the computer would do is idle with the fans going on high speed. So I got a 2 TB hardrive and installed it. We realized that the original 400 GB hardrive plug-in was damaged (not the contactors, but the plastic piece just next to them that helps hold the contactors together.) We repaired it when we installed the 2 TB alongside it and it worked for a while with the 2 TB being the master drive and the 400 GB as a slave/back-up harddrive. (The harddrives were purchased from Apple). Sometimes while we used it, it froze once in a while and we had to shut it down totally. After a few days, the computer cratered again - only this time the monitor wouldn't boot up. It was receiving power but it wasn't getting a signal. We opened it up and reset the PMU (It's an older model, no SMU), but it made no difference and then the white light next to the power button wouldn't turn on. It just sits and idles as much as it did before we replaced the harddrive. We also tried to reset the PRAM, but the computer didn't make the trademark "apple" sound. A few hours ago I was sitting next to it and I decided to give a chance for a miracle and pressed the power button; it started booting up and did the trademark "apple" sound, but still the monitor is not receiving signal. The white light next to the power button is on now. I've also noticed that the DVD Drive will not open. The computer does not always make the "apple" sound when it turns on. Sometimes it just idles. It can't possibly be the power supply because it exhibited the very same behavior only weeks ago and suddenly began working after we replaced the harddrive only to relapse, though something like that may make sense since it is now running an extra piece of hardware that was not in existence back when it was manufactured. My new guess is that the graphics card has failed. I pulled it out and took a look at it (I know that just looking at it isn't the greatest troubleshooting method but I have no other method to test if the graphics card is dead or not). Still there's the fact that the computer has been very unstable in the last week. Does anyone have any idea what is up with this computer? Is there any other way to troubleshoot/treat the problem? I've already dumped $200 into this computer with no results and I have no idea what else to do. I'd hate to lose my Mac Pro.