1: After the system checks all hardware at startup, I have to press the F1 key before it will continue booting and show the internet café startup screen. If I restore the BIOS to factory defaults, it boots normally, but after a few days the same problem comes back;
2: At startup the monitor shows "No signal input", there is no single "beep" after the motherboard self-test, no warning sound at all, and the CPU fan works normally. The repair process is very simple: remove the RAM stick and use an eraser on the gold fingers, then it can boot normally, but this has to be done many times, which means this kind of boot failure happens often. Sometimes even after a normal shutdown, when powering on again I have to clean the RAM gold fingers once more before it will boot. Later I noticed something: if on startup the monitor still only shows "No signal input", instead of turning off the case power, if I directly pull out the power plug and then power on again, it will boot normally, and there is no hard disk self-check process that normally appears after an improper startup.
3: The monitor image is not clear enough, as if there is a layer of fog over it. The monitor tube socket is normal and not damaged.
One thing that needs to be explained is that this machine is an internet café system, and the working environment is very humid in summer, sometimes there are even beads of water seeping out on the wall, but in winter it is dry. However, the above faults appear in every season. In summer, because it could not be powered on, it was not used for a long time. Later, in autumn, I had someone repair it. The repair process was just to remove the RAM stick and use an eraser on the gold fingers. From then on, it has often needed the gold fingers to be cleaned before it can boot normally, or I have to directly pull out the power plug and power on again.
I am sure it is a motherboard fault (maybe my judgment is wrong), but I still cannot find where exactly the problem is. Please give me some guidance, experts (the more detailed the better), thanks!!!!!!!!!!!!!!!
2: At startup the monitor shows "No signal input", there is no single "beep" after the motherboard self-test, no warning sound at all, and the CPU fan works normally. The repair process is very simple: remove the RAM stick and use an eraser on the gold fingers, then it can boot normally, but this has to be done many times, which means this kind of boot failure happens often. Sometimes even after a normal shutdown, when powering on again I have to clean the RAM gold fingers once more before it will boot. Later I noticed something: if on startup the monitor still only shows "No signal input", instead of turning off the case power, if I directly pull out the power plug and then power on again, it will boot normally, and there is no hard disk self-check process that normally appears after an improper startup.
3: The monitor image is not clear enough, as if there is a layer of fog over it. The monitor tube socket is normal and not damaged.
One thing that needs to be explained is that this machine is an internet café system, and the working environment is very humid in summer, sometimes there are even beads of water seeping out on the wall, but in winter it is dry. However, the above faults appear in every season. In summer, because it could not be powered on, it was not used for a long time. Later, in autumn, I had someone repair it. The repair process was just to remove the RAM stick and use an eraser on the gold fingers. From then on, it has often needed the gold fingers to be cleaned before it can boot normally, or I have to directly pull out the power plug and power on again.
I am sure it is a motherboard fault (maybe my judgment is wrong), but I still cannot find where exactly the problem is. Please give me some guidance, experts (the more detailed the better), thanks!!!!!!!!!!!!!!!
