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Optiquest monitor not powering on7/9/2023 Leave your video card installed however do reseat the card and be sure it is fully seated in the slot. 2 Pull out any add-in cards ie sound, nic/lan, etc. NEVER put in a capacitor with a lower voltage rating. 1 System OFF, open the case and pull the pw connectors from ALL drives both hd and optical. Thirdly, the old capacitor has two values written on it: it's capacitance and its voltage rating you need to find a capacitor with the same capacitance (normally indicated in uF) and with the same or greater voltage rating. Could be the f4 button or a button with two monitors on it, for the external monitor to work. NOTE: You may have to press an 'external monitor' button. Connect an external monitor to the laptop. So make sure you install the new capacitor as the old one was (match the arrow on the side of the capacitors). Turn the laptop off (not sleep or hibernate but off). Secondly, the kind of capacitors refered (called electrolytic) don't take nicely to reverse polarity normaly they explode. If you want to follow this article, make sure that the power supply is disconnected from the mains for at least one hour before touching it. So not only there are potencialy fatal voltages and currents flowing but these voltages remain for some time after desconnection. Switching power supplies work by rectifing and filtering mains power, thus creating a input voltage of 155 VDC (from 110 VAC) or 310 VDC (from 220 VAC) and then switching that voltage through a high-frequency transformer, to be reduced, rectified and filtered on the output side. First off, a word of caution: if you have little electronics experience, don't try this.
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