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shutting off when? Shutting off immediately when you try to start it? Shutting off after it has run for a while?
If it is shutting off after it has run for a while, then it is probably running hot. If you try to restart it immediately it will not boot. If you let it cool off for a while then it will boot successfully (definitely a sign of running hot).
Things that make a computer run hot: 1) Dust in the vents, fans, cpu & heat sink and all inside the computer. 2) Fan not working 3) The Thermal Paste on the cpu and heat sink has either dried up or is too thin to keep it cool.
If it shuts down immediately after it has been sitting for a while then it's not running not and your system has some other problem.
Shuts down when? Right after you boot it up? Or does it run a while then shut down? If it shuts down after it has run for a while then the computer is probably running hot. Either the CPU Fan is not working or the Thermal Paste has dried up or is too thin to keep the CPU Cool. To prove it is running hot, let the computer sit for a while then boot it up. Once it boots up use it until it shuts down and immediately try to boot it up. If it does not boot up that means it's running hot. But if you let it cool off then try booting up you will be successful.
Sounds like you are overheating. One way to tell if it's overheating is you say it will run for about 30 minutes then shuts down. When it shuts down try rebooting to see if the boots successfully. If it fails to boot successfully right after it shut down then you are probably overheating. If you wait awhile to let it cool down for 30 minutes or so and if you reboot and it does it successfully you definitely have a overheating problem. If I remember correctly all those compaq sr series have loud and fast running fans. Computers overheat because of three reasons for the most part: 1) A fan has stopped working. 2) The Thermal Paste on the CPU and Heat Sink has dried up or is not thick enough to keep the unit cool. 3) Dust has clogged the fan vents and inside the computer. Fortunately for you desktops don't have to be completely disassembled like laptops to get to the fan, CPU and heatsink. Just pop the case and you'll see the components attached to the motherboard
When does it shut itself off? Is this happening time you press the power button and during the boot cycle it shuts off without completing the boot to windows? If it shuts down after you've worked on it for a while it could be that it is running hot. If you let it sit a while to cool off then press the power button, if it completes the boot cycle and allows you to work it is definitely running hot. Normally when they run hot if you immediately try to reboot, it will fail. If you let it cool off it will boot successfully. Computers run hot because of a fan not working, dust clogging the fan vents or the Thermal Paste around the CPU and Heat Sink has become hard or too thin to keep the unit cool. If it's not running hot you might have a power supply or motherboard issue. Try removing the power cord and press and hold the Power Button for 30 seconds to release any Static Buildup. Then plug the power cord back in and try to reboot.
Most likely when a computer shuts down on its own it is because the computer processor or power supply is either overheating or is under powered.
Feel with your hand around the computer case and back of the power supply (has circular fan usually/ on off switch/ and a plug goes into it)
If it is very hot you will have found your answer.
Did you just install or upgrade a processor? If so you may need to check to make sure that there is thermal compound (artic silver, etc) between the processor and heat sync. This can cause overheating and sudden shut downs. If not move on
Is your computer in a small enclosed area? Try moving it to an area with more area for ventallation and cooling.
Do you have adequate cooling/fans? are they working? if not check power cables and may need to replace the fans or install more. You can buy and install case fans pretty easily
DUST. Are the fans and imputs dirty? Keeping them clean will keep the computer running cooler and help lower temperature and avoid shut downs. If your fans/imputs are dirty remove dust by using a can of compressed air, a vacuum made specifically for pc/electronics. or you may wipe them down with rubbing alcohol and a dust free cloth.
This should help
The case fan should start running as soon as you turn on the computer. I would replace the fan with a higher capacity (CFM). If you have a case that can take 2 case fans, I would install the send fan. Also with the case off, check that the CPU cooler fan is functioning. With the quick shut off, I would suspect that the CPU cooler fan is not functioning. I could be impeded by dust. Vacuum and blow out any dust on the motherboard, fans and battery fan while you have the case off.
This should aleviate the shutoff problem due to overheating.
Let me know if this solves the problem.
Please rate this solutution. Thanks.
During when does your computer shutdown? Please check the diagnostic lights at the back as well which ones have light on it during the time it would shutdown.
Since you said that the light is blinking yellow it just says that your power supply is running outside its normal operating range. So most likely you would need a change of power supply. Maybe a higher wattage would be better.
reseat ram if not i'd say to take 1 stick of ram at a time and start the computer with such might be a ram issue or run memtest 1.7 which can be downloaded here http://www.memtest86.com/ boot to cd once downloaded and burned to test ram