About the brand of this computer I can to see in the case "Systemax" and the motherboard is a BIOSTAR
Post card testers usually go into the PCI slot. You will need to read the post card tester manual to determine what F9 means.
SOURCE: dell e510 won't make it to post
Unplug computer, disconnect all usb/monitor/internet, open it, hold power button until green led on the inside on the motherboard turns off, pop out the BIOS battery (looks like a big watch battery and use a small flathead screwdriver to depress the spring lock on one side), plug in computer, hold power button for about 20 seconds (must reset BIOS), let up on power button, wait 10 seconds and push power button. The computer should turn on. Wait for it until activity seems stable (1 min. or so). Push powerbutton to shut off.
If this has worked you have proven that it's not the power supply (it turned on). If you purchased a non dell power supply, you might try this with the original one installed.
Go buy a new battery (CR2032 3 volt). Unplug computer, open it, hold power button until green led on the inside on the motherboard turns off, pop in new battery, plug in (you should notice the power button blinking amber again), hold power button until it stops blinking (about 20 sec....again must reset BIOS), wait 10 sec., push power button. the computer should turn on. Wait for it until activity seems stabe (1 min. or so). Push powerbutton to shut off.
Now, close case, plug in all usb/monitor/internet/etc. Power up computer. You'll get an internal floppy drive error. Push F2 (maybe F1) to get into the BIOS settings and go to "drives" and turn off the internal floppy. Save and exit. The computer should boot properly now.
This seems to be a big problem with the e510, my theory is that this one small battery is the root of most of these failures (as these computers usually fail after 1-2 years), not the power supply or the motherboard (heck, when you replace the motherboard it comes with a new one of these batteries...a several hundred dollar piece of hardware, with a $5 battery that will actually fix it).
SOURCE: dell c521 won't start
- disconnect the hdd and optical drive cables, remove the expansion card, reseat the atx and 12v cable and turn the computer on. if the power led is glowing green connect the devices on by to find what device is causing the no post issue. after the strip down if the power button is still yellow replace the motherboard
SOURCE: Dell Precision 490 freezes during POST
Here is the Dell link which describes the Diagnostic LED :
https://support.dell.com/support/topics/global.aspx/support/dsn/en/tree?c=us&cs=rc957157&l=en&s=gen&treeid=0FC26DB68321317BE040030ABD6275B6&journalid=6510D0CA78AC9912E040AE0AB6E14E2A&Query=RGVsbCs0OTArZGlhZ25vc3RpYys=&SystemID=&ServiceTag=&contenttype=-1&os=-1&component=-1&lang=-1&doclang=en&toggle=false
I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309
SOURCE: D4 Post code using tech aid diagnostic card
check power supply in back to see if you have on and off switch but you would'nt be the first with this problem from dell about the power supply going out meaning:
if you don't have nothing happening when your trying to boot the computer then it's the power supply, plug in computer power up and feel in back to see if the fan is blowing if nothing power supply is gone call dell.
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