I have an Iwill DH800 and after shutting down last night, it will not post. The LEDs light, the HDD LED stays lit as does the LED on one of two DVD drives. There are no beeps and monitor does not come on. Have tried removing and reseating RAM (2 at a time), pulling IDE cables & power to drives one by one, and removing sound card that I just put in about a week ago. All no go.

DID YOU CHECK YOUR FUSES? Is there anything lighting up on it to see if it is in fact turning on? If it's lighting up and there is no protection lights lit up then check your speakers to make sure you didn't burn them up. If there is a protect LED lit then unhook your speakers and see if it stays lit or not. If it stays lit then check to make sure you're getting enough voltage at the amp connection, minimum of 11.0 volts is required just to get it to turn on. If it has under voltage and over voltage protection LEDs see if they're lit. If you do all of these things and are getting enogh voltage, your speakers are not burnt, your protection LEDs are lit no matter what then you need warranty repair that amp. If your speaker wires are shorted it will make your amp shut down also, but since you were using it for a day or so my bet is that you burnt up one of your speaker voice coils and it's internally shorted and that will cause your amp to shut down in protect mode. Otherwise you probably internally fried your amp by too low of voltage or not enough current (amperage) due to not large enough conductor (too small gauge wire) should be minimum of 8 Ga. for each amp, 2 amps will require 4 Ga, 3 or more will need 2 Ga, or 0 Ga. wiring to keep the voltage and current flow high enough to keep from damaging the amps. Good Luck!

By the way, what is the make and model of your printer?

1. Resetting the Drum Page Counter
   • 1 Toggle switch in back of the printer. Shut off the printer.
     
   • 2 Front door opened Hold down the "Continue" button while opening the front door. Then turn on the printer.
     
   • 3 Error LED lit Keep the Continue button held down until only the "Error LED" is on then release the button. Close the door.
     
   • 4 Top 3 LEDs lit. The Continue button, Ready/Data, Toner Low, and Load Paper LEDs should all be lit up.
     
   • 5 Toner low LED lit. Press "Cancel" a few times to cycle through the LEDs until just the "Toner Low LED" is lit.
     
   • 6 Press and hold the "Continue" button until the LEDs cycle through and release only when the LED stops at Toner Low.
     
   • 7 Turn the printer off and back on.
     

I hope you find it very helpful. Best regards.

one of your componants is more than likely faulty ,id start with trying another psu(power supply) that u know is working then try removing the ram 1 stick at a time and the hard drive and dvd rw/rom graphics card and plug into onboard graphics make sure u remove one componant at a time between trying to power up the system until u narrow it down it will be diffacult to correctlly diagose the problem

Check http://www.fixya.com/support/t3440299-presario_f500_laptop_problem

Power drain would be a better solution in this case.
1.first shut down the comp
2.unplug the charger
3. remove the battery
   and after press and hold the power button for 60 seconds without any charger and the battery.After the 60 seconds replug the battery and the charger and turn the computer .

This should fix the drum light being on that 1720

Turn off the power using the switch on the back of the printer. Open the front door of the printer. Hold Continue button down, power on the printer, and continue to holding Continue down until the LEDs begin to flash. When the LEDs start to flash, release Continue button. The LEDs will continue flashing until only Error LED will be lit. Close the front door. Continue, Ready/Data, Toner Low and Load Paper LEDs should be lit. Wait till the printer completes the POST process. POST is complete when fan noise and rollers stops. After POST wait for 5 seconds Press Cancel button 4 times slowly until the Toner Low LED is lit. This is the procedure resetting the counter. Press and hold Continue until all LEDs begin to cycle in sequence, then release Continue. Now only the Toner Low LED will be lit. Cycle the power of the printer: Remove the power cable - Wait for 5 seconds - Plug the power cable back to the printer - Power the Printer on.

I'm inclined to believe something is going on with the DVD drive, perhaps a I/O cable or driver issue, it just seems like what you said about the drive sounding like it's trying to read is a clue, what I would try if you have not already ,is since you said you can get to get to the Bios usually the default for boot sequence is CD/DVD drive first unless you change it, see if you can change the boot sequence from DVD drive first to HDD first and see if you can bypass it, then it might just boot, if that works then that was the cause,I see no other reason why the Drive should be trying to read other than the boot sequence. if not then it might be more complicated and could be a hardware issue somewhere,

Hoep this helps.

try removing, cleaning the contacts and reseating the memory, see if that works

regards

theres prob something wrong wif the bulb