|No display - no video - is usually merely a symptom, and there is usually nothing wrong with the display adapter or the monitor - something else is wrong. |
Tell us all your symptoms - what can you computer do, what can't it do ? What do you see other than no video ? Do the fans come on, do the drives spin. Does the hard drive activity led light up while booting, and blink ?
Bioses do NOT get corrupted spontaneously for no reason at all. Bioses CAN be corrupted if your computer expereinced a damaging event, such as a power spike or surge, but that's extremely unlikely. There is almost always NOTHING wrong with the bios, unless you or someone else has flashed the bios with the WRONG bios version, or something went wrong while flashing the bios.
The relatively primitive bios flash chip can only be flashed a small number of times, and sometimes the flash chip physically fails the FIRST time you attempt to flash the bios.
If the flash chip physically fails while flashing, it must be replaced with another one that has already been flashed,
The bios flash chip is soldered into the mboard on most computers these days, so you often do not have the option of simply unplugging the old flash chip and plugged in a new already flashed one. The soldered in flash chip can be replaced by specialists found on the web, but the cost of them doing that and shipping it to them and them shipping it back often costs more than a replacement mboard.
The most common reason for you having no video is the power supply is failing or is dead.
Failing power supplies are common and can cause your symptoms.
Check your PS.
They often partially work, fans and hard drives may spin, leds may come on, yet you may get no video and the mboard will not boot all the way.
See response 4 in this:
If it is failing, you can usually replace it with any decent standard sized standard ATX PS with the same capacity or greater.
Standard (PS/2) power supply size - 86mm high, 150mm wide, 140mm deep, or 3 3/8" h x 5 7/8" w x 5 1/2" d , or very close to that, though the depth can be more or less for some PSs.
Don't buy an el-cheapo PS.
See response 3 in this:
It can be very hard to tell if a defective, partially working power supply is the cause of your problem. If you have another desktop computer that has a power supply with the same capacity (total wattage output) or greater, or if you can borrow one, try connecting that to your computer.