Monitor black out

If the screen stays black it means there is an issue with BIOS. It should load before the HDD ever does. Mother board issue or monitor issue.

The RAM module/s maybe faulty.
Thake the RAM module/s to your friendly computer repair shop and get them to test the RAM.

so the computer is dead, you never said dead. word
only video not working sometimes, (implied not stated clear)
Desktops are most easy PC in the word to diagnose and fix.

the monitor did not lie, there is no video sync, there for no video possible and then mon, goes to sleep mode,

we call that the black screen of *****.
black means the PC never texts or shows grapics ever.
that message you say is from the monitors brain and not the PC brain. dig?
steps:
1: PC not packed in lint ,stalling all those fans.; inside.
2: The PSU fan runs, and must pin and blow are (look it its grills)
if not the PSU is bad, or the is a short inside.(overloaded)
3: the CPU fan must spin and blow air (yes inside) an fins not packed in lent.,
4: CD/dvd eject button work>? PC on>)
5: HDD heard to spin?

the goal is to get BIOS working, (even with HDD removed BIOS works) so that is why a tech uses this rule to test any PC.
the bios keys are F10 or ESC, old to new PC.
if you hammer this key the screen will show BIOS.
there are many things to prevent the video card to work
do you have a video card there, does PC have 2 DVI jacks on the rear.? i cant see it so. cant advise you easy


see the 20 steps here, im not going to repeat them all
all are valid.
http://pcdied.com/black-screen.html#Basic-basics-101

haii all.....
i facing problem on mb acer sf2 661fx rev 1.1 no power to cd rom and hdd...also monitor not shown anything... cpu fan and casing fan only working..any idea pls..

It probably is the power-supply, if the CPU-fan does not spin.
Try a different power-supply.

hope u r a professional, as u r aware of hardware hazards n minds to open up n dismantle the system..

however, plz do check the following as in order:..
the Hardware part:..
1)a) 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..[not applicable in case of laptop]..
b) in case of laptop try to get output from external display unit/monitor using vga port..if there's proper display in there..the problem is probably with either the 'lcd' or 'ccfl' or 'inverter circuit'..

2) if u hv a graphics card, replace with a standby or onboard and see..[not applicable in case of laptop]..

3) unplug mains supply..pick open/remove the cmos battery..check (above +3v)..resit..

4) 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..

5) a) see if ur hdd is noisy or emitting any 'ticking' noise (like 'tuk tuk' or 'kirr kirr')..
b) or if the system is not supporting either the newly installed device or itz software/driver /firmware
if so, u need either a fresh os installation or ur hdd is likely to b replaced..

6) remove/clean dust neatly..dust is non-uniform in nature n may cause jam/short circuitry/excess resistance n many more..resulting an increase in heat..

7) 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..

8) on main/mother board..see with a debug card for mb error..may b short..look for defective capacitors(espabove1000mfd)/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)..

9) [in case of desktop] 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 protector-transformer/resistance (esp 4.7k)/mosfet..
check the battery n adapter [main power], in case of laptops..

plz give higher priority to step 6 to 9..

always better to consult ur system admin/vendor....

I'd say it's the CPU

CPU Should work with board.Try removing cpu and replace in socket check for bent pins if all is well..reinstall.make sure to use pad or silver paste and reinstall fan.rebootRichardm69

after turning on wait for a moment.. about 5 mins. then press fn+f4

try to check the horizontal output