Your Hewlett Packard Pavilion model 1275MX computer will not turn on after you press that start button. The power button lights up, then you can hear a fan and disk spinning. Then that computer will power off. Nothing on your computer screen displays and then some lights start to blink.
One blinking light is above a scroll key and another is next to a caps lock key. You tried removing that laptop battery and power supply but receive those same results. You bought that laptop from Quality Value Conveniance and the operating system came installed with no compact disc or recovery disk.
You have tried a removal of that power supply, battery, and holding down a start button for thirty seconds. You tried starting it up and holding an F10 function key. I think you might have a failing random access memory module. You can try removing and installing again your random access memory module(s).
If you have more then one random access memory module, you can try testing one at a time until it boots properly. You will want to shut down that computer and close that display lid. Then you can disconnect all external devices connected to that laptop computer.
You will want to disconnect that power cord from an active current wall outlet. Then you will need to turn that computer upside down on a flat surface. Now you will want to remove a battery from that computer.
You will want to loosen that memory module compartment screw. Also, here is a manual for that HP Pavilion 1275mx computer with those same instructions I gave you. You can follow those instructions starting on page seven.
You will want to lift that memory module compartment cover away from that laptop computer. If you are replacing a memory module, then you will want to remove that existing memory module. You can pull away both retention clips, one on each side of that memory module.
That memory module actually tilts up. In order to prevent damage to that memory module, you will want to hold that memory module by those edges only. You will not want to touch any components on that random access memory module.
YOu will want to grasp the edge of that memory module, and then gently pull that module out of a memory module slot. If there was only one memory module installed, then can you remove and install it again in a different slot. There should be two memory slots in that laptop computer.
You can try installing that random access memory module in a different slot it was initially installed and then try to boot that computer up. You will want to attempt booting it with a bottom random access memory module still installed. You do not have to install your laptop battery back in, you can just place a cover over that random access memory if you want and then try to boot it up now.
You will want to remove that random access memory in the bottom slot and install it in top module slot and see if it will boot properly. You can attempt to boot that computer with only one memory module at a time. I am thinking it is either a faulty random access memory module or a faulty random access memory slot.
Those blinking lights near the caps lock and scroll keys indicate a faulty memory module when I searched on the Internet. You will want to test those random access memory modules one at a time. If they both do not work in the same memory slot then that slot is faulty and then you can try testing both those memory modules one at a time in that second memory slot.
If you only had one memory module installed in that laptop computer, then you can try testing both memory slots with that one memory module. You want to make sure to rule out it being a faulty memory slot. You can attempt testing each individual memory module in that same top memory slot.
If neither memory module works in that top slot, then it is probably a faulty slot. Then you will want to test each individual memory module in that bottom slot. Sounds like faulty memory if they will not work in neither slot.
Your data on your hard drive should be ok. I suggest taking that computer to a local computer repair shop. They will be able to test whether it is faulty random access memory or slots.
Some computer repair technicians will diagnose your laptop computer for free and then tell you what needs fixing. These instructions and tips were written for a Hewlett Packard laptop computer. However, you could use them as a basis point for other brand of laptop computers.