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Check all conections between the tower and the screen, make sure all are secure, if no joy, unplug the tower and remove the side panel to see if the graphics card is in securely, maybe take the graphics card out and put it back in again to be sure. If you have another monitor or monitor cable try replacing to see if the situation improves.
The fact that the monitor displays the "no signal" message confirms that your monitor is getting power and switching on but it's not getting a signal from the graphics card, either due to a fault with the RGB cable between the PC and monitor or a fault in the graphics card itself. If you're convinced that the cable is fitted securely, then the next most common cause of this is a loose or defective graphics card. Taking appropriate precautions against static electricity, open the system case, remove the graphics card and then re-seat it carefully but firmly in the slot (you'll need to disconnect the monitor cable first). Make sure that the copper contact edge is making a secure (i.e. relatively even) connection across the whole length of the card.
Do you hear any beeps? Is this a new problem? Were things OK before?
Are you familiar with opening the case? Do you have the manual?
Inside you can: Check if the fans run; clear the CMOS; Re-seat the RAM; Vid Card; CPU; those would be initial tests. Check for red lights on the front of the case & or the board itself. If no beeps try starting with the RAM removed: any beeps now?
The motherboard is not telling you there is no signal, the monitor is.. In this order:
Test the connection from graphics card to monitor, try a different monitor to eliminate this from the issues.
If other monitor works, the old one is causing the problems
If new monitor does not work:
Check the graphics card is seated properly, if possible, test with another graphics card, if this works, the issue is with the graphics card
If this does not work, check the fan on the cpu, is it spinning? If not, make sure the fan is connected to the motherboard
If the fan is spinning, remove all the ram, reboot, you should get a series of beeps, make note of these and repost them (computer will not boot)
If you get NO beeps with ram removed, the CPU or motherboard are possibly dead, if possible, replace CPU with known working one and retest with and without ram in, make sure you have thermal grease on the CPU>heatsink. Replace the Ram (or one module)
If you get a single beep and the motherboard powers the monitor, the CPU was your issue
If you get no beeps, confirmed death of motherboard.
Possible other solutions: Remove CMOS battery, leave for 1 minute and then replace, see if it boots Check the power switch from the computer front panel is not sticking
very incomplete thread..i gotta know 1st what is ur system configuration..is all ur system is getting power on..is there any light on cabinet glowing (the power n hdd)..is there is power light coming on ur monitor..is there any sound coming out of the system..or the set is dead..??..
considering that the system gets on but u get no display and assuming that the bios has not been flashed in a wrong
probably itz either minor case of loose ram/improper
ground/cmos battery.. or major case of faulty or defective smps/cpu/main board short/display adapter or card/monitor
..plz do check the following as in order:..
1) in power on mode, open/unplug the data/vga cable of the monitor from cabinet..see if raster or 'osd' is appearing on the monitor screen..if so monitor is ok..else replace the monitor and see..
2) if u hv a graphics card, replace with a standby or onboard and see..
3) see if the ram(s) is loose/faulty..open clean/remove carbon & or oxide formed on the teeth with an eraser n resit it..or replace with a standby n see..
4) unplug mains supply..pick open/remove the cmos battery..check (above +3v)..resit..
remove/clean dust neatly..dust is non-uniform in nature n may cause
jam/short circuitry/excess resistace n many more..resulting an increase
6) open the CPU Heat-Sink with fan out of the socket..put some "Heat Sink
Compound" (available in local electronics chip level spare market)
between the cpu/processor and the CPU Heat Sink *** fan..resit/fit it
tightly in position..
7) the smps itself may b defective/faulty..check the outputs of smps
viz. 0v (black~ground); +12v (yellow); +5v (red, green~ps-on, violet~pg
& grey~sb); -12v (blue); -5v(white); +3.3v(orange)..
the 'oscillator and error amplifier ic', or
pwm switching regulator circuit..look for defective
itz not the smps, then it must b ur main/mother board..see with a debug
card for mb error..may b short..look for defective capacitors(esp above
1000mfd)/mosfets..go through the mb's south bridge n the circuit lie
around atx connector..the crystal clock generator (if cpu isn't heating up)....
always better to seek advise from ur system admin/vendor....
Remove everything except CPU and 1 stick of RAM. Attach monitor to onboard graphics and under Integrated Peripherals in BIOS there SHOULD be option for display, it needs to be set to PEG so it looks for a PCIe graphics card first. If you still get no picture, DOA motherboard.
This is probably an over heating CPU(processor). Make sure the fan over the processor is working. If it is, check to see if the heat sink is fastened properly to the motherboard - if you can push on any of the corners and it moves in than there's an issue.
Also look for a thick layer of dust that might be blocking the air flow.
Discounting the possibility of a faulty monitor, (I am assuming that you have tested this, either by trying a different monitor or checking the monitor is working on a different PC (Either yours or someone elses that you know)). it sounds like your PC is not booting through BIOS..., this can be caused by all sorts of things, from faulty Power supply to Faulty MEM or even a faulty PCI or graphics card....
The first thing (except the monitor) that I would check is the Power supply.. if you can get your hands on a spare power supply that is the first thing to test (by replacing).
If that does not resolve it's a case of systematically removing all other possible causes of the fault (IE remove all PCI cards and Drives, not removing the Graphics card or MEM.
if the fault persists with all these things done you have diagnosed that the fault lies with the motherboard the CPU or the memory.